Versatile Mounting Options: This aluminum antenna bracket can be installed on vertically or horizontally bar, providing flexibility for various antenna configurations. ^^ Accepts Antennas with Standard 3/8-24 Thread ^^ Antenna mount
Center of hole size: 10mm ( 0.39 inches) ^^ Bracket with Stainless Steel Hardware provided U type Bolts, Lock Washers and Nuts for installation ^^
What's in the package: 16mm Hole Antenna Bracket, U-bolts with Nutsk, CB adapter