Technical data - Product name: Clamping Knobs M8 - Material: Bakelite - Colour: Black - Head diameter: 40 mm - Thread diameter: 8 mm Package contains: 10 x M8 Internal Thread Clamping Knob Features - Clamping Knob M8 thread Black plastic hand knob Star shaped handle for machine tool. - The knob handles are made of high quality plastic for durability and long life. - Star shape: ideal for a comfortable grip. - M8 thread: universally applicable and applicable to most machine tools. - Widely used for mechanical equipment, instruments and appliances, food and industrial equipment.