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Block walls punish a poor bit choice: a blunt or undersized masonry bit can chatter, wander, and send more vibration into your hands while making little progress. A reduced-vibration setup is not one magic bit feature. It comes from matching the bit to the drill and block, keeping the bit sharp, and using a steady technique. For most homeowner jobs, a quality carbide-tipped masonry bit is enough; SDS-Plus bits are worth considering when the drill accepts them and the holes are deeper or frequent.
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What we cover
What actually reduces vibration
Hammer drills deliver rotation plus a rapid forward-and-back hammering action. The hammering is useful in masonry, but it also creates vibration. A bit’s flute shape and carbide tip help it cut and clear dust, yet they cannot cancel vibration from the tool itself. A sharp, correctly sized bit tends to cut more smoothly than a worn one that skates or binds.
Use a drill with a side handle if available, hold it with both hands, and let the hammer action do the work. Pushing hard can make the bit bind, overheat, or break; it does not reliably speed drilling. Take short pauses during a series of holes. If you have numbness, tingling, or pain, stop rather than trying to work through it.
Choose the bit for the drill and hole
For a conventional keyed or keyless chuck, buy a round-shank carbide-tipped masonry bit. For an SDS-Plus rotary hammer, choose a matching SDS-Plus bit. SDS shanks lock into the tool and are designed for rotary-hammer use; they do not fit an ordinary three-jaw chuck unless you use an adapter, which is generally a poor substitute for the right tool.
Check the anchor instructions before drilling. A common plastic wall plug may call for a hole around 6 mm (1/4 inch), but the correct diameter depends on the plug, screw, and maker’s directions. Drill only as deep as needed, allowing a little extra depth for dust. A depth stop or a strip of tape on the bit helps avoid drilling too far.
For a few small holes in sound block, a basic carbide-tipped bit is often the economical choice. If you are making many holes, drilling larger diameters, or working in hard masonry, a higher-quality bit or SDS-Plus rotary hammer setup can improve progress and reduce the tendency to push hard. Compare carbide-tipped masonry drill bits with the bit type your drill accepts before buying.
Bit options at a glance
| Bit type | Best use | Trade-off |
|---|---|---|
| Standard carbide-tipped, round shank | Occasional small anchor holes in block with a hammer drill | Affordable and widely available; slower in hard material and can wander if started carelessly |
| Premium carbide-tipped, round shank | Repeated holes with a conventional hammer drill | Often cuts and clears dust better, but costs more and still depends on a sharp edge and suitable drill |
| SDS-Plus masonry bit | Frequent or deeper holes with an SDS-Plus rotary hammer | Efficient in masonry; requires a compatible tool and is unnecessary for a couple of small holes |
What to check before buying
Match the shank to your drill, the diameter to the anchor, and the bit length to the required hole depth. A long bit flexes more and is easier to misalign, so choose the shortest one that reaches the job. For common wall-anchor work, a small set covering several sizes can be more useful than a large collection of rarely used diameters. Look for clearly marked sizes and a carbide tip intended for masonry, not a general-purpose wood-and-metal bit.
If you need the same diameter repeatedly, buying a single replacement bit can be sensible. A multi-bit carbide masonry bit set is convenient for mixed anchor sizes, but a cheap set may include bits that dull quickly. For heavier use, consider whether an SDS-Plus masonry bit is compatible with your tool before choosing it.
Drill block cleanly and safely
First identify what is behind the wall and avoid drilling near wiring or plumbing. Mark the hole, place the bit square to the surface, and start slowly. If the bit slips on a painted or uneven face, a small starter dimple can help. Use hammer mode for concrete or dense masonry; on softer block, start without hammer action if the bit wanders, then engage it once the hole is established.
Keep the drill aligned rather than levering it sideways. Withdraw the bit occasionally to clear dust, especially in a deep hole. Dust packed in the flutes can increase friction, slow cutting, and make the bit overheat. Do not touch the tip immediately after drilling: it can be hot. Wear eye protection, and use suitable respiratory protection or dust extraction when working in dusty conditions.
Stop if the bit repeatedly stalls, the drill’s clutch slips, or progress suddenly changes. You may have hit a harder aggregate, metal reinforcement, or a void. Do not force a standard masonry bit through steel. Inspect the bit for a chipped carbide tip or bent shank; replace a damaged bit rather than compensating with more pressure.
Common causes of rough drilling
A hole that is too large can leave an anchor loose, while an undersized or dusty hole can prevent it from seating. Follow the anchor’s specified diameter and clear the hole before installation; a bulb blower or vacuum is preferable to blowing dust toward your face. If an anchor spins, the hole may be oversized, crumbling, or drilled into a hollow section that the anchor was not designed for.
For a couple of holes in ordinary block, a basic carbide-tipped bit in a sound hammer drill is usually fine. Spend more on a premium bit or move to SDS-Plus when the job is repeated, the masonry is hard, or the current setup forces you to lean heavily on the tool. That practical match—not a “low-vibration” label alone—is the best way to keep drilling controlled and reduce unnecessary strain.