Made from long lasting, top grade electro-polished stainless steel and Standard 3/8" x 24 threads. Each spring is about 3.0". For antenna mount fit mobile/in-vehicle cb radio antenna mount up to 60" long. Simple Installation: The antenna spring can be installed by simply screwing it into the stud or mounting component. The antenna spring is heavy duty,but it can't guarantee that if it will be not flex when the speed is too fast , or if it will break down when the antenna being pushed or use it for some months ,importantly every person uses a different requirement,It may be springly、weak or stiff to you, but not the same to others. so please decide twice before you buy it. Standard 3/8" x 24" Threads Fit for all standard Antennas Mounts and Accessories.
Every antenna should have a spring.Springs protect the antenna, mount and vehicle.