A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6220-01-512-9819
NSN 6110-01-576-3337
NSN 6645-01-442-0466
NSN 5990-00-932-3070
NSN 5910-01-423-8643
NSN 5990-01-113-0303
NSN 7035-01-105-2561
NSN 6645-01-571-8578
NSN 5975-01-354-2594
NSN 6645-01-400-2119
NSN 5915-01-030-1899
NSN 5855-01-100-3272