We are professional in manufacturing machine tool accessories, with a history of twenty years. Supple all kinds of clamping knobs, in various styles and different sizes & color, can meet your requirement. Material Bakelite, plastic, Cast iron, steel Surfaced process Steel, cast iron: sand-blasted / chrome bright/Blackened Bakelite: black, glossy finish Plastic: matt black Assembly Brass, stainless steel and common plated steel Special bores, keyways, etc. are available upon request