Material: Metal Colour: Silver Size: 16x3 Cm Both T-Screw and Screw are of 8mm threaded. Also for clamping jigs & fixtures. 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. This is for a set of new Hold Down Clamps for use with T-Slot track. These clamps are useful in many woodworking & metalworking applications for work holding, positioning, and fixture. Package Included: 1 x Quick Acting Hold Down Clamp set(T-Slot is not included)