Bolt-on jaws and anvil face for heavy duty metal work. Manufactured from strong, ductile cast iron and shaped to increase grip on pipe or bar up to approximately 50mm (2″) in diameter. Compatible with SuperJaws (SJA100E and SJA100P). Bolt-on jaws and anvil face for heavy duty metal work. Manufactured from strong, ductile cast iron and shaped to increase grip on pipe or bar up to approximately 50mm (2″) in diameter. Compatible with SuperJaws (SJA100E and SJA100P).