Used on mlg t38/f5 acft. 2.8650" overall length has 2 grooves on outside diameterbody .314 wide, .177 deep, .500 from left end; .550 wide, .246 deep, 1.160 from left end. also has internal GROOVE0.413 wide, .184 deep, .500 from rightend cadmium surface treated 17c solid, plain, no outside flanges