A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5965-00-359-9769
NSN 5855-01-646-1585
NSN 6220-01-162-7954
NSN 5910-00-719-7708
NSN 7035-01-528-7870
NSN 5935-01-438-2229
NSN 5996-01-374-1265
NSN 5920-00-017-2851
NSN 5985-00-934-1289
NSN 5910-01-176-4382
NSN 6135-00-911-9321
NSN 5920-00-326-9901