These are heavy-duty clamps with a bar section of 32 x 6mm (1 1/4 x 14in). The slide & head are guaranteed unbreakable & 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 & smoothly through a fast acting, hard wearing rolled thread. Slides & heads are flat bottomed so that the clamp will stand without support. Bar Length 1200mm (48in) Capacity 1050mm (42in)