Stainless steel arm for mast head. Nylon articulated base with built-in fairlead. RA 352 connector to screw on cables 29.800.10/1/12/13/14 for snap connection to PL259 VHF Radio. 5/8"x24 itting to plug to antennas 29.990.01/02/03 for compatibility with standard antenna base, 1"/14 thread.