A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5930-00-976-9657
NSN 6135-01-616-1866
NSN 6645-01-650-1860
NSN 5999-01-148-3135
NSN 6240-00-677-0305
NSN 5999-01-424-0713
NSN 5975-01-388-7431
NSN 5855-01-158-2709
NSN 6240-00-990-3226
NSN 5965-00-938-8219
NSN 6620-01-316-7907
NSN 7035-01-003-9142