Style 409-R Mounting kit Combines the versatile Style 407 Heavy-duty Swivel Mount with the Shakespeare Style 408 Insulated Stand-off Bracket. The bracket features an insert to accept 1in or 1 in diameter antennas or extension masts. Now includes a new 1 1 /8 " insert! Swivel mount is chrome-plated brass construction Standard 1in-14 thread.(male)