Reduce the chance of chipping and cracking when drilling in glass and ceramic. These hollow bits are diamond-coated for long life and fast cutting. They are for use in drill presses only and require an adapter (sold separately). Attach the threaded nut to the adapter, then install the adapter into the chuck on a drill press. Coolant, such as water, is required when drilling with these bits. The size listed is the bit's OD.

The diamond-grit edge on these hole saws cuts more accurately, leaves a smoother finish, and lasts up to twice as long as carbide-grit-coated teeth. Saws are for use on reinforced plastic, Kevlar, stone, brick, and other abrasive materials with high silicon content. Attach them to a drill or drill press. An arbor with pilot drill (sold separately) is required. To cut ceramic tile, you must use a 1/4" carbide-tipped pilot drill.