Large anvil, 60,000 PSI tensile ductile iron body parts for mass and strength , Precision thrust bearing creates greater clamping pressure and increased longevity , Extra deep throat - this design gives you more working room where it counts , Locking swivel base - 360 rotating is enhanced by serrated swivel base with double lockdowns for non-slip holding and four mounting posts , Hardened steel jaw, replaceable inserts are machine serrated for safe, sure grip under maximum torque SKU: ORSNO3996