1/4"-20 x 5/8" Zinc Finish SAE J429 Grade 5 Round Head Carriage Bolt / BASE TYPE: SWIVEL JAW NOMINAL OPENING: 8.250 INCHES JAW NOMINAL WIDTH: 8.0 INCHES SPECIAL FEATURES: THROAT DEPTH:4.750", PIPE JAW CAPACITY:0.250"TO 3.500",CLAMPING FORCE:6600LBS ,REPLACEABLE HARDENED STEEL TOP AND PIPE JAWS,POWDER COAT PAINT FINISH MATERIAL: STEEL AND IRON