Product Description Step-Over Bar Clamp, Regular Duty J Series, Opening (In.) 12, Throat Depth (In.) 5-1/2, Load Capacity (Lb.) 1100, Nominal Rail Size (In.) 1-3/16 x 19/32, Nominal Clamping Pressure 2660 lb., Spindle Dia. (In.) 25/32, Pad Type Swivel, Morpad, Swivel Type Removable, Swivel Pad (In.) 1-1/2, Screw Size (In.) 25/32, Max. Jaw Opening (In.) 12, Clamp Face (In.) 1 1/4 x 2 1/2, Bar Thickness (In.) -, Bar Width (In.) -, Bar Material Steel, Handle Length (In.) 4-5/8, Handle Material Steel, Bar Size (In.) - From the Manufacturer All the great features of the legendary Bessey sliding arm clamps with the return rail J design allows clamp to step over the lip on channel iron, angle iron, I-beam and other obstructions.