A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5910-01-598-5210
NSN 5855-01-409-1792
NSN 5945-01-077-7943
NSN 4140-01-025-4911
NSN 5945-00-088-5312
NSN 5925-01-483-8690
NSN 5855-00-885-8452
NSN 5915-01-072-0698
NSN 5945-01-555-8373
NSN 5910-01-549-5358
NSN 5835-01-572-1284
NSN 6150-01-316-1252