[High Quality Material]: Made of plastic and metal, light and convenient, good toughness, will not scratch any material, durable. [T-slot rail fixture]: Woodworking fixture integrates positioning fixture, fixing fixture, T-rail slider, woodworking table, engraving machine, metal CNC milling machine and dovetail fixture. They are easy to handle, have strong gripping forces and have a wide range of applications. [T-screw]: High standard, high precision, easy to use, the thread is not easy to slip and deform.The clamping range is up to 500mm. [Butterfly Nut]: Easy to use, not hurt your hands, easy to use. Suitable for fixing wood and metal workpieces of different heights. t The rail rod solves all problems of rail fixation. [Uses]: Used in many woodworking or metalworking applications for bevel, gap, seam, wide and acute angle track table woodworking, also suitable for fixing, marking, positioning, scribing, etc. of metal parts. Specification: Item Type: T-Track Clamp Material: plastic, metal Colour: Black Dimensions (L*W*H): about 8.5x8.5x3cm/3.35x3.35x1.18 inches Package Included: 4 sets x Press plate clamps