A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5945-01-371-2556
NSN 6135-00-112-8637
NSN 6145-01-202-8478
NSN 5910-00-414-3416
NSN 6220-01-073-3338
NSN 5930-01-075-0225
NSN 5855-01-544-6744
NSN 5965-01-296-8991
NSN 6150-01-200-0794
NSN 5910-01-495-8910
NSN 5996-00-155-9309
NSN 5925-00-727-9116