A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5905-01-647-3770
NSN 5975-01-038-8707
NSN 5999-01-381-1389
NSN 5930-00-636-4530
NSN 6145-01-279-1264
NSN 5990-01-623-0082
NSN 5999-00-230-9304
NSN 6130-01-450-8072
NSN 2925-00-964-7128
NSN 5945-01-643-2649
NSN 5990-01-615-7823
NSN 6135-00-125-5265