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 13mm/ 0.51 inch Mounting Thread Size: M5 Spherical Diameter: 20mm/ 0.79 inch Material: Thermoset Rim Style: Smooth Package Content: 8 Pcs x Ball Knob