Features 【Premium Material】The T track is made of aluminum alloy, not easy to scratch or bend, corrosion resistant and durable. 【Useful Tool】This is for a set of hold down clamps for use with T-slot rails. Very diverse! Also ideal for clamping fixtures! 【High Practicality】Applies clamping pressure anywhere along the flush mount T-slot T-track. Slides into the T-track and quickly secures with the turn of the hand knob nut. 【Multifunction】Both the T-bolt and the threaded rod are 8mm thread. For the production of clamping, positioning and clamping devices. 【Wide Application】These clamps are useful in many woodworking and metalworking applications for holding, positioning and fixing work pis. Features: Thread Size of T-screw and threaded rod: M8. Used on many woodworking and metalworking. Used to workholding, positioning, and fixturing. Slides into T-track, quickly secures with the turn of the hand knob nut. Specifications: Main Material: Metal Main Color: Silver Thread Size: M8 Package Included: 1x Whole Clamps Set (Threaded Rod, T Screw, Knob Nut, Slide Block, Washer, Clamp Board) OR 1x T Screw and Plastic Knob Nut Only Package List