Draper Expert Heavy Duty Bar Clamp, 150Mm | Hdc150These heavy duty bar clamps are made from strong and durable engineering grade plastic. They are capable of evenly distributing up to 306kg of sustained clamping force. The robust I Beam structure and C45 rail reduces unwanted bending. The TPU protective cushions safeguard the workpiece from marking and damage. One handed operation is easy, thanks to the quick release trigger. There is also a quick change button to convert the clamp to a spreader.