A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 2925-01-250-2731
NSN 6130-01-188-7411
NSN 4140-00-513-1089
NSN 5985-01-111-2923
NSN 5915-01-125-4173
NSN 6145-00-493-4073
NSN 6135-01-367-6203
NSN 5960-00-129-3204
NSN 6150-01-288-5523
NSN 5950-01-200-4500
NSN 5999-01-522-1803
NSN 5975-00-467-8777