This 58 pieces clamping claw set M12 is compatible with all types of mechanical worktable T-slots and is designed for fixed use of moulds, jig plates. You can use it to clamp a wide range of workpieces securely to the table while machining, milling or drilling. These are made of high quality hardened steel for increased durability. This set includes a variety of flange nuts, step blocks, coupling buts, studs, T-nuts and step clamps to fit almost any machine clamping need. The delivery also includes a rack. You can bolt it to the wall or side of the machine for easy access.