A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6320-01-449-1014
NSN 5910-01-147-2786
NSN 5920-00-172-9232
NSN 5910-00-201-7551
NSN 6150-00-518-2743
NSN 5965-01-472-7092
NSN 6105-01-474-5246
NSN 6110-01-642-7947
NSN 7035-01-042-5308
NSN 2925-01-587-3956
NSN 6620-01-026-0346
NSN 5835-00-080-8213