Check the listing for details. Firestik K-24A Heavy Duty Screw-On Side CB Antenna Mount w/ SO-239 K4A Stud. Condition: New. Listed at 19.95 USD. Firestik K-24A Heavy Duty Screw-On Side CB Antenna Mount w/ SO-239 K4A Stud The K-24A Heavy Duty Side Mount SO-239 Connection will mount to any flat vertical surface Includes mounting hardware & K-4A Stud for antennas up to 5 feet. These mounts are similar to our popular 3-way mounts without the clamp. All of these mounts are specifically used for mounting antennas to a flat vertical surface, such as the side of a van or motor home. These brackets are made from cold rolled steel and are finished with chrome plating. The K-24A is complete with FireStik's world famous K-4A antenna stud with screw on coax cable connector. All mounts come complete with mounting hardware. The actual size of the bracket is 2.25in (57mm) wide by 2.9in (74mm) high (4.2" (107mm) with stud). They protrude outward from the vertical surface