SS-3H CB Antenna Spring Mount to fit Mobile/in-Vehicle CB Radio Antenna Mount up to 60 Long and 3/8 - 24 Threads Made from long lasting, top grade electro-polished stainless steel. _x000D_ _x000D_ _x000D_ _x000D_ 3/8-24 thread fits all standard antennas and mounts. _x000D_ _x000D_ _x000D_ _x000D_ Protects antenna, mount and vehicle. Works with antennas up to 60" long. _x000D_ _x000D_ _x000D_ _x000D_ SS-3H CB Antenna Spring Mount - Heavy Duty Stainless Steel Antenna Electronics Spring to fit Mobile/In-Vehicle CB Radio Antenna Mount up to 60" long and 3/8" - 24 threads. _x000D_ _x000D_ _x000D_ _x000D_ Standard 3/8" x 24" Threads Fit all standard Antennas Mounts and Accessories _x000D_ _x000D_ _x000D_ _x000D_ Every antenna should have a spring.Springs protect the antenna, mount and vehicle. _x000D_ _x000D_ _x000D_ _x000D_ _x000D_