Shakespeare - 408-R Stand-Off Bracket - 408-R. UPPER BRACKET WHITE MOLDED PLASTIC. Insulated stand-off bracket of white molded plastic. Corrosion resistant. Easy-open for quick laydown.. For use with Styles 81-S and 407 Swivel Mounts and antennas of 1" (using insert provided) or. 1-1/2" diameter. Now includes a new 1-1/8" insert!