Material: The t track bolts consists of a threaded rod M8 and a plastic handle, which is not easily corroded, rusted or oxidized, and the surface is polished and impact-resistant. T-shaped screw: The bottom of the screw is T-shaped, it does not slide out easily and does not rotate with the rotation of the guide rail and has a good fixation. Thet track clamp can easily secure the wood to the drill bit and any work surface. Star Buttons M8:t-slot bolts, Hexagonal star grip design, smooth surface without burrs, does not hurt your palm, while providing grip. The internal thread is clear and the force is even. Easy to use:T track bolts are easy to install, remove and adjust, just clip the retaining clip onto the drill plate or work surface. Very Versatile: This is for a range of hold-down brackets for use witht T-slot track.are suitable for clamping, positioning and fastening workpieces in many wood and metalworking applications. Ideal for clamping devices