A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6130-00-137-0168
NSN 5935-01-415-7516
NSN 6240-01-633-9357
NSN 6150-01-246-2290
NSN 5999-01-079-4392
NSN 6145-00-978-8056
NSN 5965-01-191-0735
NSN 5895-00-948-5751
NSN 5999-00-447-4285
NSN 6105-00-205-0655
NSN 5855-01-429-8702
NSN 5915-01-435-5275