Comet Original AD-35M Antenna Mount Adapter UHF Female (SO-239) to 3/8-24 threaded antenna mount The Comet AD-35M heavy-duty adapter allows a 3/8x24 antenna stud to mount to an SO-239 mobile connector This quality adapter is machined from solid bronze and chrome plated. It weighs 5 ounces and stands 2.65 inches tall. The AD-35M is very strong and virtually unbreakable. Adapts a threaded 3/8 x 24 connector to a PL-259 Allows an SO-239 mobile mount to accept a 3/8 x 24 threaded antenna stud.