Stanley STHT83166 2-Inch by 4-Inch Clamp Eliminates the need to carry around bar clamps or pipe clamps Stanley - Black & Decker High Quality New!!!!!!! Non-mar pads to protect work surfaces Eliminates the need to carry around bar clamps or pipe clamps Clamps can be inserted and repositioned anywhere along a 2"x4" 400 pounds of clamping force and up to 850 pounds when bolted to a 2"x4" Non-mar pads to protect work surfaces