High quality material: Our T-slot pliers are made of high quality alloy, and the surface is treated with oxide coating, which has certain wear resistance, anti-corrosion and anti-rust, durable . Function: Our T-slot clamps are a T-shaped sliding rail stopper, carpenter's position limiter and a fixed gripping tool for woodworking clamps. Simple operation, high clamping force and wide range of applications. Wide range of applications: Our T-slot clamps are used in many fields of woodworking and metalworking for the assembly and positioning of parts and are a godsend for carpenters. (Threaded rod diameter is 8mm and fits M8 thread.) Spring Nut: Our T-slot clamps use a spring-loaded nut to hold the T-clamps, the spring-loaded snap clips have better retention, and toggle clamps also feature cylindrical support rods.