A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6620-01-192-6186
NSN 5985-01-415-2225
NSN 5925-01-564-1340
NSN 5910-01-245-9648
NSN 5915-01-067-8365
NSN 6110-00-998-1243
NSN 5975-01-481-0423
NSN 6645-01-148-4703
NSN 5960-00-140-9583
NSN 5930-01-658-5992
NSN 5999-01-451-4906
NSN 6150-00-875-7657