A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5990-00-901-2574
NSN 5895-01-465-2871
NSN 6130-01-198-7084
NSN 5998-00-879-5276
NSN 5950-00-026-0212
NSN 6130-00-758-3095
NSN 5855-00-411-8688
NSN 6320-00-036-3688
NSN 6130-01-442-6052
NSN 6145-00-421-0968
NSN 6685-01-181-6232
NSN 5920-01-417-5989