Featuring a constant pitch - first choice for cutting thin sheet materials up to 3mm thick. For producing high quality holes in wood, steel, brass, bronze, cast iron, aluminium and plastic. Featuring a hardened HSS cutting edge welded to a tough alloy steel body. Heavy duty shatter-resistant construction; virtually unbreakable. 6 teeth per inch. 38mm (11/2") cutting depth. Features and Benefits Constant pitch: 6 teeth per inch Max. cutting depth: 38mm Heavy duty shatter-resistant construction Ideal for cutting thin sheet materials up to 3mm thick For producing high quality holes in wood, steel, brass, bronze, cast iron, aluminium and plastic