This bench clamp is made of premium aluminum alloy and stainless steel, which is and not easy to break. The bench dog is easy to lock or unlock and can apply adjustable clamping pressure of up to 600 lbs, which prevents movement of the workpiece. The bench dog clamp is and easy to use with one hand. It allows you to adjust the clamping pressure on your workpiece easily without damaging it. This clamp is for general woodworking tasks such as milling, cutting, and grinding. Its small size makes it easy to carry around, making it a helpful tool for your work. Product Name: Bench Clamp Size: 115x100mm / 4.53 x 3.94 inch Installation aperture : 20mm(0.79inch) Pressing range: material thickness within 70mm/2.76inch Scope of application: woodworking desktop auxiliary pressing Applicable scene: Woodworking workbench pressing wood Material: Aluminum alloy + stainless steel colour: gray+black Package Contents: 4 x Bench Clamp Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.