-3H CB Antenna CB Springs Repair Parts Heavy Duty up to 60" Long CB Radio Antenna Springs Standard 3/8" x 24 Threads. -3H CB Antenna is Made from top grade electro polished stainle steel material, strong and durable, heavy duty, easy to use and using for a long life.-3H CB Antenna Spring Fit for Mobile or in Vehicle CB Radio Antenna Mount up to 60" Long, Standard 3/8" x 24 threads, perfect fit for vehicles, , trucks, RV, motorhomes, boats, and so CB radio antenna mount spring installs between the mount and antenna and provides flexibility in the event that the antenna is jarred, protects antenna, mount and vehicle.Screw the CB antenna spring into any CB mount, and then screw the antenna into the top of the disconnect, simple, convenient, and fast.1 Pack of heavy duty stainle steel antenna-3H CB Antenna Replacement. CB Springs Heavy Duty Stainle Steel. cb radio antenna springs mount Repair Parts. Mobile in vehicle CB /8" - 24 Threads Mount up to 60" Long Spring.