Feature: 1. STAINLESS STEEL: Stainless steel antenna spring provides a better broadcasting experience and is made of durable, top grade electro polished stainless steel for rugged durability. 2. VIBRATION PROOF: Mounts between the bracket and antenna to provide flexibility in the event of antenna impact or vibration. Suitable for mobile, vehicle mounted CB radio antenna mounts, supports up to 60 inch antennas. 3. STANDARD 3/8 INCH, 24 THREAD: Standard 3/8 inch, 24 thread fits all standard antenna mounts and accessories such as CB antennas, etc., great for off road vehicles, trucks, RVs, motorhomes, boats, etc. 4. EASY TO INSTALL AND REMOVE: CB antenna spring with quick installation and removal. Screw the CB antenna spring into any CB stud or holder, then screw the antenna into the top of the CB antenna spring. 5. LONG SERVICE LIFE: CB radio antenna mount spring is manufacturer tested for ease of use and long life. The spring base allows the antenna to flex, thus reducing damage from impact. Specification: Item Type: CB Antenna Spring Material: Stainless Steel Suitable For: Antennas Up To 60 Inch Long Thread: 3/8 Inch, 24 Thread Size: Approx. 8.8 x 2.2cm / 3.5 x 0.9in. Package List: 1 x CB Antenna Spring Note: 1. The antenna spring is heavy duty but it is not guaranteed not to bend when going too fast or to fail when the antenna is pushed or used for a few months. It is important to note that everyone has different requirements and it may be flexible, weak or stiff for you but not for others. 2. Please allow some error due to manual measurement.