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 65mm to 915mm square.