These Stanley Bi-Metal Hacksaw blades are supplied in a pack of 100 blades. The bi-metal steel blades are manufactured from carbon steel for flexibility and high speed steel for cutting special steels and other metals. The blades combine super hard teeth with a safer blade that flexes under load. Suitable for cutting metal, copper, iron, steel, bolts, plastics and aluminium. Length 300mm (12 inch). 24 TPI.