A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5920-00-499-8285
NSN 5930-01-233-3275
NSN 5975-01-483-1113
NSN 6130-01-541-4979
NSN 5945-01-576-8492
NSN 5930-00-384-0570
NSN 5985-01-169-9368
NSN 7035-01-562-4438
NSN 5998-01-119-7658
NSN 6650-01-576-3258
NSN 5999-01-337-3346
NSN 6110-01-305-7330