Once a hole grows past about half an inch, a standard twist bit becomes slow, heavy work that overloads the drill. The best drill bits for large holes either remove only a ring of material or use a reduced.

Deep holes demand reach, straightness and reliable chip clearance that a standard bit cannot deliver. The best drill bits for deep holes are extended-length designs engineered to run true and evacuate chips well beyond the depth an ordinary jobber-length.

Plastic and acrylic crack, melt or grab if you drill them like wood or metal. The best drill bits for plastic use a modified point that shaves cleanly instead of biting in, so the bit does not snatch through.

Sheet goods look easy but splinter and blow out without the right tool. The best drill bits for plywood and MDF cut the surface fibres cleanly before removing waste, so both faces stay crisp and free of the ragged.

Dense hardwoods such as oak, maple, hickory and walnut dull and burn cheap bits fast. The best drill bits for hardwood combine a sharp cutting geometry with enough steel quality to shed heat and stay keen through an entire.

Drilling glass looks intimidating, but with the right tool it is straightforward and clean. The best drill bits for glass are diamond-coated, because glass is a hard, brittle material that ordinary twist bits simply cannot cut without cracking or.

Tile is hard, glazed and brittle, so the wrong bit skates across the surface or cracks it clean through. The best drill bits for tile are diamond bits for porcelain, stone and glass, or carbide spear-point bits for softer.

Brick and block are softer than concrete but still far too abrasive for metal-cutting bits. The best drill bits for brick are carbide-tipped masonry bits, used with a gentler touch than you would ever use on concrete. Here is.

Concrete is dense, abrasive and full of hard aggregate that destroys metal-cutting bits in moments. The best drill bits for concrete are carbide-tipped masonry bits driven by a hammer drill or rotary hammer. Here is what to look for,.

Thin sheet metal grabs a standard twist bit, punches through suddenly, and leaves torn, triangular holes with a razor burr. The best drill bits for sheet metal are step bits for clean round holes, or sharp cobalt twist bits.