A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6145-00-420-6491
NSN 5990-01-136-4068
NSN 5960-01-364-9795
NSN 5998-01-479-5900
NSN 6685-01-417-1807
NSN 5905-00-203-0599
NSN 6645-01-285-9431
NSN 6645-01-062-0905
NSN 6135-00-643-4843
NSN 6645-01-519-2220
NSN 6150-01-070-0781
NSN 5920-01-459-8493