Expanded Pressure Plate Design: Upgraded area pressure plate, which does not damage the wood when in use, and the pressure is more stable Easy to Use: This clamps is easy to use, and the knob handle is more for clamping and pressing the, and the pressure can be adjusted : This bench dog clamps woodworking quick pressure plate is aluminum alloy, which is and easy to carry Range of Use: Suitable for clamping and fixing materials within 70mm thickness please check the size; suitable for carving, chiseling, sanding, machining, and general woodworking 19 / 20mm Hole: Fully matching with 19mm / 20mm holes, clamping tightly and not slipping out of the hole, Manufacturer: Tsophreniq