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Choosing a bit for tile, glass, or porcelain is less about buying the biggest set and more about matching the cutting edge to the material. A basic carbide masonry bit can work on some soft ceramic wall tile, but it is a poor choice for hard porcelain or glass. The wrong bit, hammer action, or excess pressure can crack a tile before the hole is deep enough for an anchor.
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Choose the bit for the material
For ordinary glazed ceramic tile, a spear-point carbide tile bit is a practical, inexpensive choice. Its pointed tip helps keep the bit on location, and it can drill clean holes at low speed. These bits are not universal: they tend to cut hard porcelain slowly and wear out sooner than diamond bits.
For porcelain, glass, and frequent tile drilling, look for a diamond-grit bit or hole saw rated for the material. Diamond cuts by abrasion rather than with a conventional sharp edge. It usually lasts longer in dense porcelain, but still needs light pressure and cooling. A diamond bit is not automatically better for every job; for one small hole in soft ceramic, a carbide tile bit may be cheaper and fast enough.
Before buying, check the bit’s stated material compatibility and the diameter range. A set of small twist bits marketed for glass may not include the larger sizes needed for pipework or an anchor. For a faucet or shower fitting, you may need a diamond hole saw rather than a standard twist-style bit.
Bit types at a glance
| Bit type | Best fit | Trade-off |
|---|---|---|
| Spear-point carbide | Occasional holes in ceramic wall tile | Low cost; slow or short-lived in hard porcelain |
| Diamond-grit twist bit | Glass and small holes in porcelain or ceramic | Needs careful cooling and light pressure |
| Diamond hole saw | Larger openings in tile, such as for plumbing | More expensive; needs a guide or a steady start |
| Carbide masonry bit | Brick or concrete behind the tile, after the tile is pierced | Can chip tile if used on its surface or with hammer action |
What to buy
If you drill tile only once in a while, a small set of spear-point carbide tile bits is a sensible starting point for ceramic. Buy the size you need rather than assuming a large assortment means better quality. For regular work or hard porcelain, choose a diamond-grit tile and glass bit set with clearly listed sizes and material ratings.
For larger holes, a diamond tile hole-saw set is more appropriate than trying to enlarge a small hole with sideways pressure. A guide is useful, especially on a smooth glazed surface where the saw can skate. If you only need one opening, buying a single correctly sized hole saw may cost less than a set.
A cordless drill is enough for drilling tile. Use the drill’s regular, non-hammer setting; do not engage hammer action on the tile. A hammer drill is useful only after the bit has passed through the tile and you need to drill masonry behind it. Stop first, change to a masonry bit if needed, and use hammer action only when the backing material calls for it. An impact driver is not the right tool for delicate tile drilling.
How to drill without cracking tile
Confirm what is behind the tile before drilling. Pipes, cables, and waterproofing layers may be close to the surface. Choose a spot away from tile edges when possible; drilling near an edge increases the chance of a crack. Mark the hole, then place masking tape over the mark if it helps the bit stay put. Tape is a positioning aid, not a substitute for a suitable bit.
Set the drill to low speed. A useful starting range is roughly 300–600 rpm for small tile bits, though the bit maker’s instructions take priority. Hold the drill square to the surface and let the cutting edge work. Pushing hard creates heat and side load; either can chip the glaze, overheat a diamond bit, or crack the tile. For a hole saw, start at a slight angle to establish a groove, then bring the drill upright once the saw has a stable track.
Keep diamond bits cool. Use water where the tool and job allow it, or follow the bit maker’s dry-drilling instructions. Do not pour water near an energized drill or its battery. If the bit becomes hot, stop and let it cool rather than trying to force progress. A worn bit that produces dust slowly and needs increasing pressure is often cheaper to replace than a cracked tile.
Once through the tile, pause and identify the backing. For wood or drywall, switch to the appropriate bit. For brick or concrete, use a masonry bit after the tile layer is clear. Keep hammer mode off until the bit is past the tile; turning it on early can shatter the surface. When installing a wall anchor, match the hole diameter to the anchor packaging, not just the screw size, and account for the tile plus the required embedment into the wall.
Common mistakes and when to save money
The most frequent failures are using hammer mode on the tile, drilling too fast, leaning hard on a dull bit, and using a masonry bit from the start. Another common mistake is treating “tile” as one material: a bit that handles soft ceramic can struggle badly in dense porcelain. If you are unsure, test the bit on an offcut or an inconspicuous spot before drilling a visible tile.
For one or two small holes in ceramic, a budget carbide bit is usually fine if it is sharp and you work patiently. Pay more for diamond bits when you have hard porcelain, glass, a larger hole, or several holes to drill. A premium set is not worthwhile if its sizes do not match your fittings, and no set prevents damage if the drill is pushed too hard or the tile is already poorly supported.