The Eclipse ESC54 Sash Clamp is guaranteed unbreakable Sash clamps have an average clamping force of 500 kg 1100 lbs. The ductile head and slide are guaranteed unbreakable, whilst the steel bar offers maximum tensile and yield strength. The slightly tapered jaws enables parallel clamping and the fast action rolled thread applies pressure quickly and smoothly to the workpiece. Features: The slightly tapered jaws enable fine parallel clamping Sash clamps have an average clamping force of 500 kg 1100 lbs The ductile head and slide are guaranteed unbreakable, whilst the steel bar offers maximum tensile and yield strength Specification: Size: 54in