1″ 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.