Description: shiny finish carbide ball knob. Suitable for general applications such as lawn mowers, exercise equipment, machinery, valves, plugs and so on. Specifications: Product Name: Ball Knob, Installation Type: Female Thread Thread Thread Depth: Approx. 34 mm Mounting Screw Size: M20 Spherical Diameter: 50 mm Material: Thermoset Resin Rim Style: Smooth Package Content: 1 x Ball Knob