A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5965-01-382-9081
NSN 5935-00-926-3099
NSN 4140-01-462-2487
NSN 6610-01-498-0524
NSN 4140-01-500-9644
NSN 6150-01-099-4339
NSN 5996-01-012-1924
NSN 5975-01-361-8650
NSN 6145-01-171-5977
NSN 5950-00-615-6535
NSN 5855-01-553-1162
NSN 6105-00-084-3984