Features:This is for a set of hold down clamp for use with T-slot track.These clamps are useful in many woodworking & metalworking applications for work holding, positioning, and fixturing.Puts clamping pressure anywhere along the flush-mounted T-slot T-track.Slides into T-track & quickly secures with the turn of the hand knob nut.Both T-screw and threaded rod are of 8mm threaded.Very versatile! Also perfect for clamping jigs & fixtures!Specifications:Main Material: MetalMain Color: SilverThread Size: M8M8 Plastic Handle Size: Height Approx. 26mm / 1in,Shape: Approx. 46.5mm / 1.8inChute T Screw Size: M8 Male Long Approx. 100mm / 3.9inT Hat Size: Approx. 12.6 x 22.5 x 3mm / 0.5 x 0.9 x 0.1inPackage Includes:1 x T Screw and Plastic Knob Nut Just.