This is a set of hold-down clamps for use with a T-track. Slides into the T-track and quickly attaches by turning the knob nut. These fixtures are suitable for many carpentry and metalworking applications for mounting, positioning and securing. Clamp pressure anywhere along recessed T-slot. Made of 304 stainless steel with a passivated surface that resists corrosion, rust or oxidation. T-screw and 8 mm threaded rod. The T-slot set is very versatile and ideal for clamping jigs and fixtures. Size:01 Features: Main material: metal. Main color: silver. Thread size: M8. Optional types: 01 set of clamps. 1 T-screw and plastic nut only. Content: 01 set of clamps (threaded rod, T-screw, nut, sliding block, washer, clamping board). 1 T-screw and plastic nut only.