These are heavy-duty clamps with a bar section of 32 x 6 mm. (1 1/4 x 14 in.). 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 main screw 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 1200 mm. (48 in.) Capacity 1050 mm. (42 in.).