A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5835-01-642-4705
NSN 5935-00-948-3482
NSN 6320-01-466-4175
NSN 7035-01-151-0265
NSN 5990-00-236-8152
NSN 6240-00-548-0209
NSN 5895-01-473-5900
NSN 5895-01-604-6491
NSN 5930-01-202-5971
NSN 6650-01-481-3618
NSN 2925-00-441-8252
NSN 7035-01-136-7404