Material: These star knobs are made of high-quality rubber wood and carbon steel for durability and long service life. Star Shape: The surface is well polished and provides a comfortable grip. Advantages: Smooth surface and no burrs, high-quality workmanship, sturdy and durable. Neat and clear threads, even force is not easy to cause the screws to slip. Replacement: Star knobs are ideal for manual adjustments in mechanical engineering. They are excellent accessories to replace your old or broken knob handles. Application: For securely fixing and holding control panels on assemblies, fixtures, and machines. Widely used for mechanical appliances, instruments and apparatus, food, and industrial equipment. Ideal for comfortable grip, match ergonomic design, and play a non-slip effect without scratching your hands. The knob nuts are made of durable materials for durability and long service life. Widely used in mechanical equipment, furniture decoration, machine tool equipment, industrial equipment, electronic equipment. They are great accessories to replace your old or broken knob handles. Product Features: The star-shaped knob is made of high-quality bakelite, sturdy and durable, ideal for machine tools. The thread is neat and clear, and the force is uniform and not easy to slip. The surface of the nut is smooth and flat without burrs, high-quality workmanship, and suitable for long-term use. term Features: Name: Through Hole Star Grip Nut Material: Bakelite + Carbon Steel Size: M6 Outer Diameter: 39mm Size Description: For example M6 (nut inner diameter 6mm) Notes: Due to manual measurement, there may be slight errors