Check the listing for details. 6pcs - Star Knobs 1/4-20 Thread 38mm Head Through Hole Brass Insert Knob Black. Condition: New. Listed at 13.66 USD. Standard Thread Size: 1/4-20Head Diameter: 38mm / 1.5"Thread Depth: 7mm / 0.28"Total Thickness: 18mm / 0.71"Step Size: 19.6mm x 6mm / 0.77" x 0.24" (D*T)Style: Star Knob with Through HoleMaterial: Plastic, BrassColor: Black6pcs x 6-Point Star KnobsDescriptions:Star knobs are made from plastic material ensuring durability and long-lasting performance. Brass metal screw-in female threaded insert offers high strength and corrosion resistance for long service life. Sturdy and durable threaded knobs provides a smooth surface, comfortable grip and ergonomic operation for enhanced user control and ease of use.The star design adjusts and tightens easily for maximum control and flexibility without the need for additional tools.