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 14mm/ 0.55 inch Mounting Thread Size: M6 Spherical Diameter: 25mm/ 0.98 inch Material: Thermoset Rim Style: Smooth Package Content: 15 Pcs x Ball Knob