A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6110-01-188-8017
NSN 6645-01-202-7986
NSN 4140-01-158-6507
NSN 5965-01-456-6622
NSN 6650-01-603-8177
NSN 5910-01-601-9556
NSN 5996-00-147-9323
NSN 6645-01-451-1295
NSN 6150-00-205-6775
NSN 5975-01-177-1425
NSN 5910-01-640-6820
NSN 5985-01-121-4593