A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6610-01-144-8401
NSN 5855-01-583-3214
NSN 5998-01-295-8140
NSN 6105-01-067-9320
NSN 5905-00-636-9999
NSN 6130-01-112-0158
NSN 6650-00-820-4577
NSN 5930-01-046-3762
NSN 5960-01-632-6576
NSN 6320-01-473-9024
NSN 6150-01-286-1464
NSN 5960-01-360-4107