The 135 Series Heavy-Duty Sash Clamps have a bar section of 32 x 6mm (11/4 x 14"). The slide and head are guaranteed unbreakable and the 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. Clamping force: 500kg.