The Stanley STHT83166 2"x4" Clamp is a handy, versatile clamp which eliminates the need to carry around bar clamps or pipe clamps. It has non-mar pads to protect work surfaces. Both clamp heads can be easily inserted and repositioned anywhere along the 2"x4". This clamp provides much versatility; 2"x4"s are easily accessible and can be modified to any length and this clamp will stand upright on 2 feet allowing project to be lifted off work table. Provides 400lbs of clamping force (Up to 850lbs when bolted to 2x4).