3/8×24 threads for compatibility with antennas & accessories Internal locking mechanism for security Weather Protected Components Additional Security with Push and Twist Locking Mechanism Accepts Antennas to 5′ Long Installed size measures 2.9 inches (74mm) high x 0.600 inches (15mm) diameter Made of Chrome Plated Machine Brass Locking Pin and Spring are Stainless Steel Use for High Theft Areas or Garaging Your Vehicle or Parking Structures
