Features: This is for a set of holding clamps for use with the T-slot track. These clamps are useful in many woodworking applications for woodworking wood, positioning and securing. Puts clamping pressure anywhere along recessed T-track T-track. Slides into T-track se quickly secures by turning the hand knob nut. T-screw and threaded rod are 8mm threaded. Very versatile! Also perfect for jig fixtures! Specifications: Main material: metal Main color : silver Thread: M8 Package includes: 1 x set of pliers whole (threaded rod, t-screw, knob nut, slide block, washer, clamp panel) OR 1 x plastic t-screw and knob nut just< /p>