The Stanley (STHT83166) 2-inch by 4-inch clamp allows you to make clamps of any lengths out of any existing 2 by 4-inch pieces of lumber (2-by-4). Since 2-by-4s are available on most job sites and in most homes, you won’t have to carry around heavy and dirty pipe clamps or bar clamps. Both clamp heads can be easily inserted and repositioned anywhere along the 2-by-4. Non-mar pads protect work surfaces. The clamps will stand upright allowing project to be lifted off work table. The clamps can also be used as a spreader. Clamp heads can be fixed to the 2-by-4s with screws or bolts for additional clamping force. This Stanley clamp is light and easy to transport while also providing 400 pounds of clamping force – and up to 850 pounds when bolted to a 2-inch x 4-inch beam.