A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5855-01-506-2016
NSN 5990-00-389-0554
NSN 5895-01-394-8428
NSN 6685-01-383-4980
NSN 6150-00-436-5454
NSN 6620-01-415-5803
NSN 5945-01-201-3224
NSN 5930-00-998-0027
NSN 6150-00-630-0537
NSN 6240-00-258-2389
NSN 5905-01-433-2831
NSN 5855-01-535-7127