Brand : DRILLCO Features : Special tungsten carbide teeth One piece construction requires no assembly Ejection spring ejects slug Safety collar stop Cut longer and faster than holesaws and twist drills, increasing productivity on the job For Cutting up to 1 in thick materials Specifications : Size: 3-1/2 in Shank: 1/2 in Applications : For cutting steel plate, iron, aluminum, copper, cast iron, stainless steel, FRP (i.e fiberglass) and plastics Maximum cutting depth : 1 in