A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6150-01-384-3995
NSN 5985-01-622-6079
NSN 6610-00-211-8989
NSN 6685-01-412-0100
NSN 5960-01-089-8155
NSN 5925-00-952-8641
NSN 6135-00-027-3914
NSN 2925-00-474-4990
NSN 6320-01-202-8761
NSN 5935-01-127-1630
NSN 5915-01-449-3198
NSN 6220-00-100-4937