A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5950-00-538-5325
NSN 5950-00-208-6812
NSN 5930-01-145-3253
NSN 5950-01-510-2461
NSN 4140-00-232-1039
NSN 6145-01-487-8981
NSN 6685-00-358-8331
NSN 5925-01-397-2655
NSN 5975-01-426-6741
NSN 5999-01-012-1934
NSN 5935-01-540-4018
NSN 5945-01-429-7567