Excellent material: The star button is made of high quality PP and metal, with smooth edges, anti-corrosion and anti-rust, not easy to break, sturdy and durable, suitable for long-term use.Easy Installation: The button adopts star-shaped screw design, easy to use and install.Allows easy use.This knurled button can be a good replacement for damaged buttons.PRACTICAL DESIGN: High surface finish and comfortable grip.The ergonomic design is non-slip and does not scratch your hands.Tightening knobs are ideal for manual adjustments in mechanical engineering.WIDE APPLICATIONS: Widely used in machine tools, mechanical equipment, instruments, power, industrial equipment, etc.Provides a comfortable grip on most types of machine tools.Sufficient quantity: Can meet the needs of daily use.