Pro Trucker, ultra durable and light weight aluminum double groove mirror mount 2-bolt design includes SO-239 stud for CB radio antenna. Features and Benefits: Lightweight and ultra durable aluminum construction Double groove design for better grip on your mounting surface 2 bolt design allows you to tighten the mount to your specs Versatile 3-way mount design Includes standard SO-239 stud for mounting 3/8" x 24 threaded antennas Slim Form Factor This mount is a great fit for most Firestik, Wilson, Pro Trucker antennas and more! Easy setup and installation makes this a top choice for CB'ers looking for a consistent and long lasting mount. This mount includes the stud, in addition to install hardware!