A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5935-01-322-4568
NSN 5915-01-009-6400
NSN 5910-01-534-7557
NSN 5960-01-386-3855
NSN 5975-01-052-1433
NSN 4140-00-547-8918
NSN 5990-01-218-5160
NSN 5990-01-384-2697
NSN 6685-01-055-6057
NSN 5855-01-158-2709
NSN 6320-01-420-0340
NSN 5945-01-381-0156