A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5920-01-254-9978
NSN 5835-01-497-5029
NSN 6105-01-647-8770
NSN 5935-01-477-7762
NSN 6685-01-272-1868
NSN 5930-01-289-2118
NSN 6135-00-191-6444
NSN 6320-00-403-6003
NSN 5999-01-603-7340
NSN 6145-01-181-4142
NSN 5990-01-056-6413
NSN 7035-00-300-3208