Features: Simple and practical, and the screw is equipped with a wrench, which is convenient for users to adjust the tightness, and can firmly clamp the wood to ensure that the wood will not move during cutting, grinding and other operations. 19mm and 20mm size design enables all parts to cooperate well, ensuring the stability and reliability of use. Selected from metal, which have durability. Metal can withstanding greater pressure and is not easy to deformed, so it is suitable for carpentry for long time. Suitable for desktop woodworking, both amateurs and professional can use this set of tool for accurate wood processing. The screw design with wrench make the operation simple, and users can easily adjust the spacing of tenons by turning the wrench, thus adapting to different size of wood. Specifications: Component:Metal Type:19mm/20mm Size:Approx.167x51x50mm/6.57x1.96x2inch Package Includes: 1Pc benching Dog Clamp note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.