The Faithfull Piercing Saw Blades have been sesigned for cutting thin sheet metal such as steel, copper, brass and aluminium. Spare blades for FAIPRS.1 x Pack of 12 Faithfull Piercing Saw Blades 130mm (5in) 32tpi Faithfull Piercing Saw Blades 130Mm (5In) 32Tpi (Pack Of 12) in Silver