A tempered steel band maintains an even clamping pressure on the workpiece. The band passes through four aluminium corner brackets. Their internal corners have self-aligning plastic jaw faces for use on non-square work. The plastic jaws are removable when clamping square or rectangular work. A large handle with a screw thread applies the required pressure. By removing the aluminium corner pieces entirely, you can clamp oval, circular or coopered work. For use on frames 65 mm to 915 mm square.