-The open clamp attachment allows quick and easy connection to the pole; it connects to 1 to 1.25 inch (25.4 to 31.8 mm) OD poles -The brass male 5/8 x 11 captive stud is easily removed for direct attachment of the radio antenna to the bar -Comes with a non-slip Velcro® cable strap to help manage the radio cable -Can be used with the Radio Antenna Adapter 2133-00 which adapts 1-1/8 x 18 radio antennas to any 5/8 x 11 threaded tip (sold separately) -Weigh: 0.22 lb (0.10 kg)