7/8" x 7/16" Shank diamond carbide hole cutter. Over 300 cuts in stainless steel. Cuts up to 1" deep with 1" reach for profiles and pipe. Patented auto spring ejecting plug. Cuts stainless steel, iron, cast iron, heat treated aluminum, copper, fiberglass, carbon fiber, and most abrasive materials like butter. Works fantastic in your cordless drills.