This new antenna stud from Driver extreme is designed to securely hold heavier CB and ham antennas, providing reliable performance and durability. Whether you're an avid CB radio user or a professional trucker, this mount is engineered to withstand the rigors of long-distance travel and harsh weather conditions. The stainless steel nut is 3/8" x 24 thread, so it's compatible with most antennas. The dome itself is made from high quality ABS plastic to keep your antenna upright for years to come.