The #5B 6 In. Max Circle Cutter can produce precise circles in sheet metal, brass, copper, soft steel, aluminum, plastic, wood and composition materials. Durable body of heat-treated tool steelAdjustable to various diameters by the included hex wrenchOnly safe to use with drill press running at less than 500 rpm1 to 6 in. size circle cutterShank size/shape 3/8 in./roundReplaceable cutting blade and 1/4 in. pilot drill3/8 in. shank