1-3/8" Turbo diamond Core bit for concrete, brick, block, tile, hard stone, granite and marble. Fast Cutting. 3 3/8" long, 2 1/4" cutting depth, 5/16" shank. Works great on all hand drills. If you need to drill through tile, marble or any lapidary and have a drill, this is the product. Comes with 1/4" carbide pilot bit and cooling holes.