A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5935-00-732-0545
NSN 5965-00-678-8725
NSN 5905-01-125-4478
NSN 6135-01-010-0891
NSN 5996-01-142-0878
NSN 5965-00-217-2476
NSN 4140-00-490-2666
NSN 6650-01-399-8552
NSN 6320-01-281-6028
NSN 5925-01-579-0785
NSN 6150-00-596-9882
NSN 6650-01-582-8083