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 15mm/ 0.59 inch Mounting Thread Size: M6 Spherical Diameter: 30mm/ 1.18 inch Material: Thermoset Rim Style: Smooth Package Content: 2 Pcs x Red Ball Knob,2 Pcs x Black Ball Knob