Made from long lasting, top grade electro-polished stainless steel. 3/8-24 thread fits all standard antennas and mounts. Protects antenna, mount and vehicle. Works with antennas up to 60inch long. -3H CB Antenna Spring Mount - Heavy Duty Stainless Steel Antenna Electronics Spring to fit Mobile/In-Vehicle CB Radio Antenna Mount up to 60inch long and 3/8inch - 24 threads. Standard 3/8inch x 24inch Threads Fit all standard Antennas Mounts and Accessories Every antenna should have a spring.Springs protect the antenna, mount and vehicle. Colour:silver Material:Stainless steel Package Contents: 1 x -3H CB Antenna Spring Mount Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.