The perfect portable tool for the professional electrician, plumber, mechanic and general contractor. Productive tool that is a cost effective alternative to bi-metal holesaws. For cutting steel plate, iron, aluminum, copper, cast iron, stainless steel, FRP (i.e. fiberglass) and plastics up to 1" thick. 9/16" to 3" have 3" shank, 3-1/4" to 4-1/2" have 1/2" shank. Junction / Switch Boxes, Metal Studs, Appliances, Auto Body Repair, Truck Body Repair, Truck / Trailer Frames, Ductile Pipes. CT7-9/16, Champion 9/16" Carbide Tipped Hole Cutter, Cuts up to 1" thick, Champion CT7 hole cutters feature two sets of three cutting blades, each with different geometries. , This unique system balances the cutting forces enabling rapid, smooth drilling with better control.