A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6240-01-429-9002
NSN 5935-01-625-4225
NSN 5950-01-537-1110
NSN 6135-00-835-7210
NSN 5996-01-425-1455
NSN 5930-01-425-1352
NSN 4140-01-515-7294
NSN 5930-01-634-0659
NSN 6320-01-384-7079
NSN 5910-00-412-1360
NSN 5835-01-641-0073
NSN 5998-00-865-3708