A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6240-01-195-1750
NSN 6135-01-222-5464
NSN 5935-01-411-6300
NSN 6610-01-353-7075
NSN 5985-01-421-1721
NSN 5910-01-322-5913
NSN 6150-00-468-0752
NSN 6220-00-503-2831
NSN 5935-01-108-4615
NSN 6135-01-122-4448
NSN 6220-00-266-8222
NSN 6110-01-322-8585