A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5930-00-515-2746
NSN 5855-01-211-2437
NSN 6110-01-606-8081
NSN 6220-01-205-3624
NSN 5975-01-658-3581
NSN 5895-01-250-9569
NSN 6320-01-300-7994
NSN 5999-00-473-3551
NSN 6650-00-740-7338
NSN 5990-01-492-0215
NSN 5920-01-505-9550
NSN 5835-01-150-6084