Sturdy and Durable: Thread clamping knob made of high grade black Bakelite and brass, injection molding technology, star shaped head knob, beautiful appearance, durable and insulation, rust and corrosion resistance. Star Shape: Ideal for manual adjustments in mechanical engineering, Replace your old or broken handles knob. Star Head Diameter: 40mm, Female Thread Diameter: M8, Total Height: 28mm. Portable: Specially designed for convenient hand tightening operation, wonderful replacement for broken thumb screw used in the equipment that require insulation and frequent removal for maintenance. Convenient to Use: Large Bakelite knurled handle for comfortable grip, fully threaded screw on type design for easily installing, removing and adjusting. Application: Widely used for furniture, shelves, stand, fitness equipment, advertising, medical equipment, mechanical equipment, instruments and apparatus, electronic assembly line and so on. Specification: Material: Bakelite + Brass Color: Black