General purpose carbon steel. Ideal for cutting mild steel, brass, aluminium, copper and similar materials. Pack of 5 blades consisting of: 1 x 300mm (12in) x 18 tpi.3 x 300mm (12in) x 24 tpi.1 x 300mm (12in) x 32 tpi. Stanley Flexible Hacksaw Blade 300Mm (12In) Pack 5 Blades (18 24 & 32Tpi) in Silver