What's inside
As an Amazon Associate I earn from qualifying purchases. This post may contain affiliate links at no extra cost to you.
Concrete pool decks are harder on drill bits than an ordinary interior slab. The concrete may contain hard aggregate, and repeated drilling can heat a bit quickly. Worse, a hole near the pool edge can chip the surface or run into a reinforcing bar. For most small fastening jobs, a quality carbide-tipped masonry bit is enough; the right shank and a controlled drilling technique matter as much as the brand.
As an Amazon Associate we earn from qualifying purchases at no extra cost to you.
What we cover
Choose the right bit for the hole
For a cordless hammer drill, start with a carbide-tipped masonry bit with a round shank sized to the anchor maker’s instructions. A common 1/4-inch concrete screw calls for a 3/16-inch pilot hole, but check the packaging: requirements vary by fastener. For sleeve or wedge anchors, use the specified diameter and hole depth rather than guessing.
Round-shank bits fit standard three-jaw chucks and are the practical choice if you already own a hammer drill. If you have an SDS-plus rotary hammer, buy SDS-plus bits instead. Their grooved shank transfers impact more effectively and helps the bit stay seated. Do not clamp an SDS bit in a regular drill chuck unless you have the proper SDS adapter; an adapter does not turn a standard drill into a rotary hammer.
Bit types compared
| Bit type | Best use | Trade-off |
|---|---|---|
| Standard carbide masonry bit, round shank | A few small holes in concrete with a hammer drill | Slower and more prone to wear in hard aggregate |
| Four-cutter carbide SDS-plus bit | Repeated holes or larger anchors with a rotary hammer | Requires an SDS-plus tool; costs more |
| Multi-material bit | Occasional holes in concrete, brick, tile, or other materials | Convenient, but not necessarily the fastest choice for many concrete holes |
| Diamond core bit | Large, clean openings or work where impact would damage the surface | Needs suitable equipment and often water; excessive for ordinary anchors |
For several holes or concrete that slows a hammer drill to a crawl, a small rotary hammer and a four-cutter SDS-plus concrete bit are a better step up than buying a costly bit for an underpowered tool. Four cutting edges can handle aggregate more consistently than a basic two-cutter tip, but neither style should be forced through reinforcing steel.
Bit size and quality
Match the diameter to the fastener, not the drill’s maximum capacity. A hole that is too large can leave an anchor loose; one that is too small can prevent full insertion or overload the fastener. Check the required embedment depth, then choose a bit long enough to reach it while leaving room to clear dust. For typical small deck fixings, holes are often only a few inches deep, but the anchor specification is the deciding measure.
For a one-time job of four holes in ordinary concrete, a reputable basic carbide bit is usually adequate. If you are drilling dozens of holes, buying a better bit—or renting a rotary hammer—can save time and reduce frustration. Cheap bits may work, but their tips can dull, overheat, or break sooner, especially in dense aggregate. A visibly rounded or chipped carbide tip is a reason to replace the bit, not to press harder.
Drill the deck without damaging it
First check where it is safe to drill. Stay clear of the pool shell, plumbing, electrical runs, expansion joints, and the slab edge. Follow the fixture and anchor instructions, and consult a qualified professional if you do not know what lies beneath the deck or whether the concrete is suitable for the planned anchor. Avoid placing anchors close to an edge: the required distance depends on the anchor, slab thickness, and load, so there is no universal safe number.
Mark the hole, wear eye protection and hearing protection, and use a dust mask suitable for silica dust. Concrete drilling produces respirable silica; keep bystanders away and control the dust with a compatible dust extractor or other method recommended for your tool and local rules. Do not blow dust into the air with compressed air. If the deck is wet, keep water away from electrical equipment and follow the drill manufacturer’s instructions.
Start with the bit square to the surface and use low pressure. Let the hammer action and cutting edges do the work. Pull the bit out periodically to clear dust, especially in a deep hole; packed dust makes drilling slower and can overheat the bit. Keep the drill at a steady speed within the bit maker’s guidance. Excessive pressure, a wobbling grip, and running the bit continuously without clearing dust are common causes of poor holes and premature bit failure.
If the bit stops suddenly or hits metal, release the trigger. Do not lean harder or keep hammering: you may be on rebar, a pipe, or a cable. Move the hole only after checking that the new location is safe. If a small surface chip forms, stop and reassess; continuing can enlarge the damage. Brush or vacuum the hole clean and install the anchor as directed. Dust left inside can keep an anchor from seating or reduce its grip.
When to upgrade—or keep it simple
A hammer drill with a fresh standard carbide bit is a sensible buy for a handful of small holes. If each hole takes several minutes, the drill bogs down, or the bit repeatedly overheats, stop and reassess the bit, tool, and concrete. A cordless SDS-plus rotary hammer is worth considering for repeated deck work, but it is unnecessary for occasional light fastening. For one isolated job, renting a rotary hammer can be cheaper than buying one. Choose the least powerful setup that safely matches the hole size and quantity, and let the anchor specification—not a bigger drill—determine the bit.