Check the listing for details. Pro Trucker Deluxe Single Groove Mirror Mount with SO-239 Beehive Stud Mount. Condition: New. Listed at 16.95 USD. Pro Trucker Deluxe Single Groove Mirror Mount with SO-239 Beehive Stud MountCB radio antenna 3-Way Mirror Mount with heavy duty Beehive SO-239 StudHeavy duty stud and great for mounting all types of antennasStandard 3/8" x 24 thread made with extremely high grade materialsGroove can be set horizontally or vertically CB radio antenna 3-Way Mirror Mount with SO-239 Stud. Heavy duty stud and great for mounting all types of antennas with the standard 3/8" x 24 thread attachment. Works great with a 2' fiberglass antenna to a Wilson 2000 Trucker style antenna. Can be mounted on a tool box if you're willing to drill extra holes. Clamping bolts are approximately 2" but you can decide to buy longer ones if you're looking to mount on a larger post like a brush guard. Easy to install, and guaranteed to last! Pro Trucker offers the best CB accessories in the industry.