A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5855-01-040-3881
NSN 5835-01-043-1576
NSN 5985-00-891-0508
NSN 5950-01-078-0338
NSN 5925-01-364-0771
NSN 5990-01-147-5225
NSN 6110-00-297-5768
NSN 6320-00-336-9123
NSN 5925-00-883-8575
NSN 5920-01-660-4268
NSN 6685-00-542-6608
NSN 5920-01-487-3700