A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5895-00-622-0022
NSN 4140-01-609-6084
NSN 5920-00-717-6839
NSN 6130-01-014-1365
NSN 5855-01-174-2463
NSN 6650-01-501-7061
NSN 5915-00-400-5398
NSN 6150-01-431-9727
NSN 5910-01-556-3192
NSN 5915-01-598-9816
NSN 5998-01-414-7684
NSN 5925-01-330-2362