Premium Material: The star handle is made of copper plastic and the surface is well polished, with good toughness and impact resistance. M8 Star Knobs: Metal handle Hexagonal star shape, smooth surface without burrs, will not hurt your palm while providing support. The internal thread is clear and the force is uniform. 【Easy to use】Screw-in design, easy to install, disassemble and adjust. Just align the internal thread with the screw and turn it vigorously. The surface is smooth and comfortable to hold. Widely used: The star knob is very suitable for manual adjustment in machinery manufacturing, and is widely used in the wind, air and gas industries, office equipment industries, etc. Quantity: We have 10pcs threaded tension knobs for your needs and they are the perfect replacement for old or broken knob handles.