Bakelite Material: The Surface Of The Extremely Stable Ball Knob Is Made Of High Quality Bakelite, Excellent Insulation Properties, Durable, Corrosion And Rust Resistant, High Temperature Resistance. Spherical DesignThe Bakelite Ball Adopts Pure Copper Thread. The Spherical Appearance Makes The Force Stable When Installing, And The Embedded Thread Is Not Easy To Slip. Perfect AccessoryBlack Mirror Glossy Ball Knob And Sturdy And Durable Design Make Lever Knobs Made Of Bakelite A Beautiful And Durable Accessory For Any Machine Tool. Seamless InstallationInstallation Is Very Simple And Does Not Require Any Technology Or Tools For Installation. It Only Takes A Few Seconds To Tighten The Ball Knob With Thread Directly By Hand. Wide ApplicationBakelite Ball Knobs Are Commonly Used In Vending Machines, Lawn Mowers, Tractors, Fitness Equipment, Machinery, Valves, Mechanical Appliances, Instruments, Food, Teapot Handles And Industrial Equipment.