A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6110-01-284-0318
NSN 6135-00-299-6918
NSN 5855-01-324-3756
NSN 5930-00-845-4589
NSN 5935-01-493-8908
NSN 5920-01-412-1080
NSN 7035-00-048-3723
NSN 6105-00-775-4249
NSN 5920-00-456-5211
NSN 4140-00-171-1387
NSN 5835-01-192-4165
NSN 6135-01-658-3265