Ultra-solid ball knob with a Shiny finish, suitable for general application,such as lawn mowers, exercise equipment, machinery, valves, spigots, etc. Product Name: Ball Knob Mounting Type: Female Thread Thread Depth: About 24mm/ 0.94 inch Mounting Thread Size: M10 Spherical Diameter:40mm/ 1.57 inch Material: Thermoset Rim Style: Smooth Package Content: 2 Pcs x Red Ball Knob,2 Pcs x Black Ball Knob