Heavy duty clamps with a bar section slide and head are guaranteed unbreakable slide is secured by a solid steel pin passing through one of the locating holes spaced along the steel bar the steel mainscrew applies pressure quickly and smoothly through a fast acting hard wearing rolled thread slides and heads are flat bottomed so that the clamp will stand without support bar length 900 mm 36 in capacity 760 mm 30 in slides and heads are flat bottomed 1353 sash clam 900 mm 36 in