professional MIL quality 0.206 inch diameter microphone plug with black metal housing and Beryilum Copper stereo plug and solder contacts. Design according to MIL-P-642/5A specifications, type PJ-068 or Signal Corps PL-68. Compatible with the microphone jack found on Collins S-line and many Drake amateur radios as well as many aviation radios. The connector features high quality construction with chuck type strain relief and slimline metal barrel to meet the high requirements for military communication equipment. Overall length 3.1 in, shell diameter of 0.49 in, finger length 1.09 in, and finger diameter 0.206 in. This plug is NOT compatible with standard 1/4" audio stereo jacks.