A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6220-01-363-9713
NSN 6240-00-755-6904
NSN 6220-01-240-5573
NSN 6150-01-511-5219
NSN 5996-00-089-6042
NSN 6620-00-170-5296
NSN 6650-00-658-9627
NSN 5960-01-112-0721
NSN 5925-00-244-0711
NSN 5910-00-948-7538
NSN 5935-00-291-4910
NSN 5985-01-454-5165