Description: 【 Spring Base】This spring base is for LED whip, fiberglass CB Radio Antenna , Center Loaded Mobile Antenna, 102" whip (Fits screw with Min diameter of 0.448" and Max diameter of 0.465" ) [Heavy Duty] Spring Mounting Base is made of premium high strength carbon steel, the Anti Shock Spring is sturdy, durable, shock resistant, and not easily deformed. [RUST RESISTANT] Spring Base for whip lights, the thick black coating on the spring is rust resistance, smooth surface. [FLEXIBLE PROTECTION] The spring structure design can effectively protect your Whip Lights or antenna, providing flexible protection from impact and vibration. [ COMPATIBILITY] Spring Mounting Base for LED Whip Light with M12*30 thread is suitable for a wide range of vehicles, for UTV , ATV , trucks, boats etc. Specification: Material: metal Size Chart: 15.7cm/6.18inch Package Includes: 1 Spring Base Note: Please allow slightly errors due to manual measurement and different monitors.