A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5950-01-304-9204
NSN 5935-00-549-1926
NSN 6620-01-124-0947
NSN 5905-01-369-9498
NSN 6220-01-536-8165
NSN 5910-01-197-7934
NSN 7035-00-020-2227
NSN 6105-01-338-5229
NSN 5935-01-569-6366
NSN 6610-00-109-2593
NSN 7035-01-432-2424
NSN 7035-01-493-9487