Separate clamp heads, offer complete flexibility in the choice of both length and material for the bar. Use timber for lighter weight and ease of working or metal box section for the ultimate in rigidity. Our clamp heads are cast iron and steel and feature an ingenious elongated pinhole, which improves the clamping performance. Pressure to the jaw faces drives the clamp heads down against the bar with equal force, maintaining the jaws at 90° to the bar. The maximum bar width is 25 mm and the depth is unlimited (within reason!).