Create Precise Miter Joint: Turn the lever with ergonomic large knob to make inside cam rotate. The rotating cam pushes the bar out, through which four sharp teeth are evenly threaded. The four hardened teeth easily penetrate the wood for firm grip and bars put very high pressure all across the miter joint for a precise glue joint Rugged & Reliable: Heavy duty chrome plated carbon steel and aluminum alloy construction allow for years of usage with no rust or wear. Hardened sharp steel teeth will not get dull or broken after repeated usage Wide Compatibility: Greatly streamline and improve the process of making window casing, door casing, picture frames, cabinet trim, and so on Ease Of Usage: First apply some glue to the joint. Then rotate the lever one half turn to let pins dig into wood and squeeze miter joint together tightly. Let glue dry for a while. Then rotate the lever one half turn in either direction to release the miter clamp. A perfect miter joint right at your fingertips Friendly Reminder: 4 small indentations are inevitably left on sides of trim. You may need to fill holes yourself Color: black Material: aluminum alloy Package Contents: 1 x Miter Clamps