Bar Clamp F-Style Sliding Arm Opening (in) 18 in Throat Depth (in) 4 in Nominal Rail Size (in) 7/8 x 11/32 Nominal Clamping Pressure 726 lb Spindle Dia (in) 0.625 Pad Type Replaceable Standard Swivel Swivel Type Replaceable Swivel Pad (in) 1-1/2 Max Jaw Opening (in) 18 in Bar Material Steel Handle Material Forged Steel Shop Floor Industrial Welding Assembly Fabricating Construction and General Purpose Clamping