9 Piece Service Engineer's Kit featuring constant pitch, bi-metal holesaws with hardened HSS cutting edge for producing high quality holes in wood, steel, brass, bronze, cast iron, aluminium and plastic. Ideal for cutting thin sheet materials up to 3mm thick. Heavy duty shatter-resistant construction; virtually unbreakable. 6 teeth per inch. 38mm (11/2") cutting depth. Kit comprises of 22, 29, 35, 44, 51 and 64mm holesaws, complete with K4 and K10 arbors and K7 Spring. Supplied in a robust plastic carry case.