Features: 1. High gloss, beautiful appearance, high mechanical strength, toughness and durability, standardized use. 2. 100% brand new and high quality, made of high quality Bakelite, with excellent insulating properties. 3. Embedded in M10 copper nut with internal thread, easy to install. Characteristics: Material: bakelite Color: black Quantity: 10 pieces. Internal thread size: M6. Diameter of the ball: 25 mm. Compatible machine tools: all available. Contents: 10 ball lever knobs.