High Quality Material: Our T Slot Clamps 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 Slots Clamps is a T-shaped slide rail stop, a woodworker position limiter, and a fixed gripping tool for wood tongs. Simple operation, strong clamping force and wide range of applications. Wide range of applications: Our T-slot clamps are used in many woodworking and metalworking fields for workpiece assembly and positioning and are a boon for woodworkers. (The diameter of the threaded rod is 8mm and fits the M8 thread.) Spring Nut: Our T slot clamps use a spring nut to hold the T-clamps, the spring-loaded pressure clamps have stronger retention, and the Toggle clamps also feature cylindrical support rods.