Some holes are simply out of reach for a standard jobber bit. Whether you are drilling deep into timber, passing wire through a wall or reaching behind an obstruction, the best extra long drill bits give you the length.

On a magnetic drill, an annular cutter runs rings around a twist bit. Because it only removes material at the rim and leaves a solid slug in the centre, the best annular cutters cut large holes in steel faster,.

Masonry chews through the wrong bit fast. Brick, block and concrete are abrasive and unforgiving, so the best masonry drill bits use a hard carbide tip that grinds and chips its way in rather than shearing like a metal.

When a job punishes ordinary steel bits, carbide steps up. The best carbide drill bits hold a keen edge at high temperatures and shrug off the abrasion that would round over high-speed steel in a matter of minutes. The.

When plain high-speed steel dulls halfway through a stainless plate, cobalt is the answer. The best cobalt drill bits carry a percentage of cobalt alloyed through the whole bit, so heat resistance holds even as the cutting edge wears.

A well-chosen set saves money over buying loose sizes one at a time, but only if the bits inside earn their keep. The best drill bit sets combine the right material, a sensible size range and a case that.

Most home projects call for a hole long before they call for anything fancy, so the smart move is a versatile kit rather than a drawer full of odd, mismatched bits. The best drill bits for home DIY start.

Wood punishes the wrong bit with splintered edges, wandering holes and burnt walls. The best drill bits for woodworking are ground specifically for timber: brad-point bits for clean, precise holes, wood augers for deep bores, and holesaws for large.

HVAC installs live and die by two kinds of holes: a large, clean pass-through for the refrigerant line set, and secure anchors for condensers, air handlers and mounting brackets. The best drill bits for HVAC work are large holesaws.

Plumbing means making holes for pipe to travel through a building, and often big holes, in awkward places, through framing you can barely reach. The best drill bits for plumbers combine holesaws for sized pipe openings with extra-length and.