A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5975-00-210-4652
NSN 5915-00-454-5901
NSN 5895-01-336-1885
NSN 6650-00-930-8825
NSN 6135-00-299-6918
NSN 4140-00-277-6285
NSN 6105-00-339-0285
NSN 5945-00-946-4445
NSN 5999-00-334-0136
NSN 5895-01-523-5411
NSN 6135-00-461-3590
NSN 5925-01-503-4357