Package Includes 2 nut: 17mm x 33.5mm x 37.5mm, with 8mm hole; 2 bolts: dimension 8 mm x 100 mm x 22 mm. These T-slot clamps are universal sizes and fit most T-tracks that accept standard 8mm bolt heads. High Quality The quick action holding clamp are made of high quality metal, strong and durable, not easy to bend; The inner triangular nut is made of brass and the outer shell is made of high quality polypropylene plastic, light but hard, not easy to break when tightened. Useful Hardware It is a T-shaped clamp clamp set, which is suitable for use with T-shaped guide rails or T-shaped grooves. It has high tension clamping effect to meet your firm construction needs and reliable. Range of Application These holding clamps are ideal for holding, positioning and fixing wood or metal working such as routers, drill presses, CNC , table saws, jigs, panels, vertical milling machines and more. Quick Installation Slide the bolt head into the T-slot and tighten the triangle nut up and down. down until tight to complete the attachment. The operation is simple and quick, saving time and effort. Note: Due to manual measurement, the listed sizes may vary slightly. Colors may vary slightly depending on monitor settings.