A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6150-00-661-0184
NSN 6135-00-377-9165
NSN 5990-00-038-6482
NSN 5965-01-483-3356
NSN 6620-01-010-0518
NSN 4140-01-356-6126
NSN 4140-01-188-8160
NSN 5985-01-569-8711
NSN 5905-00-097-7631
NSN 5930-01-633-3026
NSN 6110-01-342-1932
NSN 5930-01-422-0537