Bakelite Material: The surface of the extremely stable ball knob is made of high-quality bakelite, offering excellent insulation properties, durability, corrosion and rust resistance, and high temperature resistance. Spherical Design: The bakelite ball features a pure copper thread. The spherical appearance ensures stable force application during installation, and the embedded thread is not easy to slip. Perfect Accessory: The black mirror glossy ball knob with a sturdy and durable design makes bakelite lever knobs a beautiful and long-lasting accessory for various machine tools. Seamless Installation: Installation is simple and does not require any tools or technical skills. The threaded ball knob can be tightened by hand in seconds. Wide Application: Bakelite ball knobs are commonly used in vending machines, lawn mowers, tractors, fitness equipment, machinery, valves, mechanical appliances, instruments, food processing equipment, teapot handles, and industrial equipment.