A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5930-01-620-8577
NSN 6105-00-187-6070
NSN 6110-01-362-0298
NSN 6110-01-469-7980
NSN 5920-01-378-2490
NSN 5905-01-647-0225
NSN 5905-01-431-9177
NSN 6685-01-378-7090
NSN 5950-01-440-8857
NSN 5905-01-473-7986
NSN 5910-01-394-9468
NSN 5925-01-659-8637