Features: The mounting screws of the screw clamps is covered with thick nonslip rubber pad, and waffle shape prevents slipping. Make of Threaded steel, hard, shatterproof and deformation resistant, compacts and able to bear high torque. Thanks to the adjustable construction, the opening width of the vice can be freely adjusted according to the actual needs. Also, the alignment of the woodworking clamps can be adjusted to your needs. The surfaces is smooth to avoid the risk of injury when working and reduce wear of the clamped objects. As a vise, ferrule or tensioner, this mounting clip is intended for woodworkers, woodworkers, welders, builders or DIY enthusiasts. Suitable for general clamping requirements, assembly, fixing, gluing and welding in metalworking and automotive industry. Specifications: Materials: Threaded steel Size: about 93x50x10mm/3.66x1.97x0.39inch Maximums opening: about 57mm/2.24inch Depth: about 28mm/1.1in Package Includes: 4Pcs/set C Clamp note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color.