A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5999-00-982-8054
NSN 5960-01-163-8905
NSN 5990-00-568-4940
NSN 5935-01-500-3343
NSN 5985-01-432-0157
NSN 5935-00-585-3589
NSN 5960-01-168-1063
NSN 5985-01-322-3909
NSN 4140-01-168-0661
NSN 6240-01-270-3655
NSN 5915-00-760-8176
NSN 5920-01-483-7632