Porcelain tile punishes ordinary drill bits. The dense, glass-fired surface chips standard twist bits in seconds, leaving you with a cracked tile and a half-finished bathroom. A proper diamond-tipped core bit grinds through that hardness with a controlled ring of abrasive grit, which is why every pick below pairs a diamond cutting edge with a heat-management feature. Whether you’re mounting a showerhead, running a new electrical line through a backsplash, or setting a towel bar, the right bit turns a risky job into a routine one.
A Quick View Of The Lineup
BGTEC 2pcs 1″ Diamond Hole Saw 5/8-11 Thread
ONEGOTOOL Diamond Hole Saw Kit 10 Sizes
ONEGOTOOL 1/4″ Diamond Hole Saw Pair
KURSTOL 11pc Tile Hole Saw Kit with Chamfer Bit
DKIBBITH 1/4″ Dry Diamond Core Drill Bit Pair
HIGHDRIL 5-Pack 1/4″ Diamond Core Drill Bit
ONEGOTOOL 10pc Hole Saw Set with Chamfer
ONEGOTOOL 6-Pack Vacuum Brazed Hex Shank Bits
ONEGOTOOL 13pc Hex-Shank Drill Bit Set
The Picks, Examined More Closely
The BGTEC 1-inch core bit is built for the dirty side of tile work, namely running water lines and shower valves through finished porcelain walls. Its 5/8-11 thread mounts directly on an angle grinder, which gives you the torque to grind through dense material without bogging the motor down. The 15mm diamond rim height and 50mm working depth cover most standard wall thicknesses, so you can punch clean holes in one continuous pass.
Lateral slots on both sides of the bit barrel clear away stone dust as you grind, which keeps the cutting surface from packing up and glazing over. Compared to the small-diameter pairs reviewed below, this one trades finesse for raw cutting ability, and the trade-off shows up when you try to make a precise 6mm anchor hole. Stick to 25mm and up and the bit performs as intended.
Strengths Worth Knowing
- 5/8-11 thread mates with standard angle grinders for high-torque cutting
- Side holes clear debris fast, keeping the diamond rim exposed
- 1-inch diameter suits shower valves and pipe penetrations
- Works across porcelain, ceramic, granite, marble, and brick
Honest Caveats
- Too large for small anchor and screw holes, so it can’t be your only bit
- Requires a grinder rather than a standard cordless drill
- Dry drilling shortens bit life, so plan on water for repeated use
Key Attributes
Who Will Love This
Plumbers and bathroom remodelers running valve and supply lines through porcelain walls.
Where Another Pick Suits Better
For mixed plumbing and electrical work, the ONEGOTOOL Diamond Hole Saw Kit (Item 2) covers a wider size range.
The ONEGOTOOL ten-piece set covers more diameter range than most homeowners will use in a single project, but that’s the point. Sizes step from 6mm up to 68mm, so you can drill a small wall anchor and a toilet flange in the same day without swapping kits. Each bit is built around dry-drilling diamond technology, so you skip the water tray setup for quick fixes.
The aluminum case is a quiet win on a crowded job site. Bits click into individual slots instead of rattling around loose, and the case lid keeps the diamond rims from knocking together in transport. Compared with the two-piece pairs earlier in the list, this set trades raw bit thickness for versatility, and the trade-off shows up in the larger sizes where cutting speed can slow on thick stone.
A Strong Showing
- Ten sizes from 6mm to 68mm cover most fixture rough-ins
- Dry-drill design removes the need for water management
- Aluminum case keeps bits organized and protected
- One kit handles porcelain, ceramic, granite, and concrete
Trade-Offs
- No chamfer or finger bit included for finishing edges
- Storage case adds bulk to a tool bag
- Larger diameters may need slower feed pressure on granite
Whose Shelf It Belongs On
DIYers tackling mixed fixture installations in kitchens, bathrooms, and laundry rooms.
Skip It When
If you only need small anchor holes, the DKIBBITH 1/4″ Dry Diamond Core Drill Bit Pair (Item 5) costs less and covers that niche.
The 6mm ONEGOTOOL pair targets the small end of tile drilling: drywall anchors in tile, soap dispensers, towel bar mounts, anywhere a plastic anchor needs a clean 1/4-inch pocket. Sharp diamond particles and a smooth machined surface give the bits a controlled cut, and the optimized cutting geometry keeps heat from spiking during repeated holes.
You can run these dry for short bursts or wet for longer sessions, depending on how many holes your project calls for. The catch is the 5/8-11 thread, which limits these to angle grinders rather than standard drills. Most homeowners don’t own a grinder, so the bits may sit unused unless you already have one in the shop.
A Few Strong Suits
- 1/4-inch diameter is the sweet spot for plastic anchor holes
- Sharp diamond grit cuts fast on porcelain
- Two bits in the pack covers multiple anchor points
- Works wet or dry for project flexibility
Soft Spots
- 5/8-11 thread requires an angle grinder, not a cordless drill
- Heat can build during repeated holes without water
- Limited to one diameter, so a second set may be needed
Built With In Mind
Homeowners with a grinder who need clean anchor holes in porcelain and ceramic tile.
Look Elsewhere When
If you want a hex shank for a standard cordless drill, the ONEGOTOOL 6-Pack Vacuum Brazed bits (Item 8) mount directly in a drill chuck.
The KURSTOL kit pushes past the standard hole saw bundle. Eleven pieces cover hole saws from 6mm to a generous 102mm, plus a 50mm chamfer bit, a 4.5-inch cutting disc, and an SDS-to-5/8-11 adapter. The vacuum-brazed diamond rim is heavier-duty than electroplated bits, which is why this kit appeals to remodelers running one or two full bathrooms at a time.
The adapter is the underrated feature here. SDS rotary hammers have the torque to push through thick porcelain and stone, and the included adapter lets you mount the hole saws without buying extra arbors. Compared with the smaller ONEGOTOOL sets, this kit gives up compact storage for raw cutting range.
Good Reasons To Consider
- Eleven pieces cover small anchors up to 102mm drain holes
- Vacuum-brazed diamond cuts faster than electroplated bits
- SDS adapter included for rotary hammer use
- Chamfer bit and cutting disc round out tile prep work
Points To Keep In Mind
- Heavier and bulkier than compact 5 or 6-piece sets
- 102mm bit is overkill for typical residential anchors
- More pieces mean more chances to misplace a single bit
The Right Fit
Renovation crews and serious DIYers running full bathroom or kitchen tile projects from start to finish.
Reach For A Different Pick When
For simple anchor and accessory holes, the HIGHDRIL 5-Pack (Item 6) covers the same small diameters with less to manage.
The DKIBBITH pair solves a specific problem: small-diameter bits run hot, and heat kills the diamond rim faster than abrasion does. Dense cooling wax packed inside the bit barrel melts during drilling and pulls heat away from the cutting surface. The result is a small bit that survives longer dry sessions than you might expect, especially in tight spots where adding water is impractical.
Dimensions stay compact: 6mm diameter, 62mm total height, 35mm working depth. The thread again is 5/8-11, which means grinder use only. Most DIYers won’t push past ten or fifteen holes in a session, which is the realistic envelope for this style of bit before the wax depletes.
Points In Its Favor
- Internal cooling wax extends dry-drilling life
- 6mm diameter suits plastic anchors and small fasteners
- 10mm diamond rim height for sustained cutting
- Two-pack covers a project without buying spares mid-job
Small Caveats
- 5/8-11 thread restricts use to angle grinders
- Wax depletes after extended dry sessions
- Working depth of 35mm may fall short on thick slabs
Who Should Grab It
Tile installers drilling small anchor holes in tight spaces where water cooling isn’t practical.
Swap It Out When
For drill-mounted use without a grinder, the ONEGOTOOL 13pc Hex-Shank Set (Item 9) provides hex shanks for standard chucks.
The HIGHDRIL five-pack targets a different mounting style. Triangle shanks grip tighter in three-jaw chucks and won’t slip under load, which matters when you’re pushing through porcelain without a pilot hole. The vacuum-brazed diamond rim and side grooves for chip clearance show clear attention to the heat and dust problems that slow down small bits.
Wax filling inside the barrel provides the same cooling benefit seen in the DKIBBITH pair, so you can run dry without immediately burning through the diamond. The 65mm total length and 10mm diamond segment keep the bit compact enough for wall tile but limit deep countertop cuts.
Strong Points
- Triangle shank resists slippage in standard chucks
- Five bits cover a full room’s worth of anchor holes
- Side grooves clear stone chips during drilling
- Wax cooling extends dry-drilling sessions
Honest Caveats
- Limited to 6mm diameter, so larger holes need a different bit
- 65mm length may be too short for thick countertop work
- Triangle shank requires a compatible chuck, though most are
Best Suited To
Multi-room tile projects with many small anchor points, such as bathroom remodels with multiple accessory mounts.
Where Another Pick Suits Better
For varied diameters in a single project, the ONEGOTOOL 13pc Hex-Shank Set (Item 9) gives you 12 sizes plus a finger bit in one case.
The second ONEGOTOOL set swaps the wider size spread of Item 2 for finishing tooling. You get eight hole saws spanning 6mm to 100mm, a 50mm chamfer bit for beveling the edges of penetrations, a 20mm finger bit for tight-radius cuts, and a thread adapter. The chamfer and finger bit matter when you want clean, professional-looking transitions around pipes and valves rather than raw cut edges.
Same dry-drill diamond tech and aluminum case as the sister kit, so storage and transport stay consistent. The trade-off is fewer sizes in the standard hole saw spread. If your project leans on 12mm, 16mm, and 22mm diameters, you may find yourself reaching for the Item 9 set instead.
Features That Help
- Chamfer bit finishes penetration edges cleanly
- Finger bit handles tight-radius cuts in tile corners
- Adapter included for common drill and grinder mounts
- Aluminum case keeps everything organized
Small Caveats
- Skip sizes may not match every common anchor or pipe
- Extra pieces mean more to track in a busy job
- Dry drilling still demands water for long bit life
Right Fit For
Plumbers and finish-focused remodelers who want clean, beveled edges around pipe penetrations.
Not Your Match When
For pure size variety without finishing bits, the ONEGOTOOL Diamond Hole Saw Kit 10 Sizes (Item 2) covers more ground.
Vacuum brazing bonds the diamond grit to the steel barrel under heat and vacuum, which produces a tougher cutting surface than electroplated bits. The result is a noticeably longer service life, especially for DIYers who don’t want to baby a fresh bit. The six-pack covers the four most useful small diameters: 1/4, 5/16, 3/8, and 1/2 inch.
Hex shanks make the bits drop into a standard cordless drill chuck, no adapter required. Internal cooling wax helps again on dry sessions. Compared with the BGTEC grinder-only bit at the top of the list, the trade-off is cutting speed: the smaller diameters and cordless drill RPMs can’t match a grinder’s torque, so larger holes take patience.
Benefits That Matter
- Vacuum brazed diamond outlasts electroplated rims
- Hex shank fits any standard cordless drill
- Four useful small sizes in one pack
- Internal cooling wax supports dry drilling
Worth Bearing In Mind
- Smaller diameters mean longer cut times on thick porcelain
- Hex shank can slip in worn chucks
- No large sizes for plumbing rough-ins
Perfect Match For
Cordless drill owners drilling frequent anchor and accessory holes in porcelain, ceramic, and glass.
Where A Sibling Pick Shines
For grinder-driven power on larger holes, the BGTEC 1″ Diamond Hole Saw (Item 1) covers diameters above 25mm with more authority.
Thirteen sizes from 6mm to 35mm, all on hex shanks, all in one aluminum case. This set speaks directly to the homeowner who owns a cordless drill but no angle grinder. Step the bit size up by 2mm at a time, so you can usually find a close match for plumbing and electrical rough-ins without buying specialty bits.
Same dry-drill diamond tech and protective case seen in the other ONEGOTOOL kits. The trade-off is no chamfer or finger bit, so finishing the edges of penetrations means buying a separate tool. For pure drilling range on a drill-only setup, though, this is the broadest case in the lineup.
The Practical Payoff
- Thirteen sizes cover nearly every standard anchor and pipe
- Hex shank works in any standard cordless drill
- Dry-drill compatible for quick fixes
- Aluminum case keeps bits sorted and protected
Less-Strong Areas
- No chamfer bit for finishing penetration edges
- Top size of 35mm won’t cover shower valves
- More bits mean more to misplace over time
Made For
Drill-only DIYers handling varied tile work across a home without specialty tools.
Consider Something Else When
For plumbing work that needs a shower valve-sized hole, the BGTEC 1″ Diamond Hole Saw (Item 1) handles that diameter on a grinder.
What To Weigh Before Choosing Tile Drill Bits For Porcelain Tiles
Shank and Tool Compatibility
The shank on a diamond bit determines which tool can drive it. A 5/8-11 thread mounts to an angle grinder, which delivers the torque to grind through dense porcelain without bogging. A hex shank drops into a standard cordless drill chuck, which most homeowners already own. Matching the shank to the tool you have on hand is the first decision, and it often rules out otherwise appealing options before any other factor matters.
Bit Diameter and Project Scope
A single bit can only drill one size of hole. Buying a 25mm bit for a 6mm anchor job means wasting the bit’s potential and possibly cracking the tile from the wrong approach. Kits that step from 6mm through 35mm or higher cover most residential fixture mounts. Specialty sizes above 50mm only earn their place when you actually need them for drains or large valves.
Diamond Bonding Method
Electroplated bits bond a single layer of diamond grit to the steel barrel and cut well until that layer wears smooth. Vacuum-brazed bits fuse the diamond under heat and vacuum, creating a thicker, more durable cutting surface. For occasional projects, electroplated bits cost less and perform fine. For frequent drilling, the brazed bits earn their price through longer service life.
Heat Management and Bit Longevity
Porcelain conducts heat poorly, so all that friction concentrates at the cutting edge. Wax-filled bit barrels melt during drilling and pull heat away from the diamond rim, extending bit life in dry conditions. Water cooling works even better, but it adds setup time and mess. Picking a cooling method you can actually live with on a busy job site matters more than the marketing claims around it.
Key Considerations Across These Picks
Pitfalls Shoppers Hit
The most common mistake is grabbing a carbide-tipped masonry bit and expecting it to work on porcelain. Standard masonry bits rely on impact to chip concrete, and porcelain laughs at that approach. The result is a glazed, useless bit and a chipped tile. Confirm the bit uses diamond grit, not carbide, before you buy.
What The Higher Tier Buys
Spending more on a diamond bit usually means a tougher bond, not a sharper initial cut. Vacuum-brazed construction holds the diamond grit longer than electroplated, so a premium bit survives dozens of holes where a budget bit gives up after a few. For a one-time towel bar, economy works. For ongoing tile work, the upgrade pays back in fewer replacements and fewer mid-project bit swaps.
Frequently Asked Questions
Can You Drill Porcelain Tile With a Regular Drill Bit?
Standard twist bits skate across porcelain’s surface and burn out almost immediately. Diamond-tipped core bits are designed to grind through the hard, glass-fired surface rather than chip it, which is why they remain the standard for clean holes.
Do You Need Water When Drilling Porcelain?
Water cools the diamond rim and clears debris, which extends bit life significantly. Dry drilling works for short bursts, especially with wax-filled bits, but for more than a few holes in a row, water or a steady wax reservoir is the difference between a bit that lasts one project and one that lasts many.
What Size Hole Is Best for Plumbing Rough-Ins?
Shower valves typically need 25mm to 35mm cores, while supply lines need smaller diameters around 10mm to 15mm. Choosing a kit with the right spread lets you handle multiple plumbing penetrations without buying extra bits.
How Long Does a Diamond Tile Bit Last?
A small electroplated bit can produce a dozen or so holes in porcelain before the diamond wears smooth. Vacuum-brazed bits push that number much higher, sometimes into the dozens or more depending on the material and cooling. Drilling force and water use both swing the number in either direction.
Can Diamond Bits Drill Other Materials Too?
Most diamond core bits work on ceramic, granite, marble, glass, and brick alongside porcelain. Masonry and concrete are within reach, though production drilling on those materials calls for hammer-drill-rated bits. Sticking to the materials each bit is rated for protects the diamond rim and the surface.
