Pro Trucker Heavy Duty Chrome Plated Brass SO-239 Stud for CB Radio or HAM Radio Antenna (BULK) Made with Outstanding Design and Material Quality Can be Used in Any Mount or Mounting Surface with a 1/2" (13mm) Hole Standard size and fits most antennas - 3/8 x 24 threaded Fits most makes and models as long as there is a large enough hole drilled and/or the vehicle has a compatible mount installed Overloaded Mobile is an authorized reseller of all Pro Trucker products