A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5960-01-502-6270
NSN 2925-01-027-1293
NSN 6610-00-814-0569
NSN 5835-00-198-4936
NSN 2925-01-629-9416
NSN 6320-01-380-7372
NSN 5985-00-162-5936
NSN 6145-01-294-8222
NSN 5998-01-173-0686
NSN 5855-01-374-9116
NSN 5985-01-429-5716
NSN 2925-01-111-2927