The interchangeable blade can be positioned at eight different angles by turning the screw in the handle
The 321 is supplied with a Sandflex bi-metal blade, 310 mm (12 1/4"), 24 TPI
Interchangeable blades:321-7-SB: A special tooth hardened carbon sawblade 7 TPI for cutting in plastics, fibres and wood321-18-SB: A Sandflex bi-metal blade 18 TPI for thicker metal cutting321-24-SB: A Sandflex bi-metal blade 24 TPI for thinner metal cutting