Firestik SS3H | Heavy-Duty Stainless Steel Spring | 3/8-24 Thread
Every antenna should have a spring. Springs protect the antenna, mount and vehicle. These springs are made from long lasting, top grade electro-polished stainless steel. The upper and lower inserts are made of chrome-plated machine brass and have standard 3/8"-24 threads to fit all Firestik antennas, mounts and accessories. The heavy duty model may be used with antennas up to 60". Physically, each spring is about 3.0" (76mm) tall with a diameter of 0.800" (20mm).