A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5965-01-351-4615
NSN 6240-01-361-9167
NSN 5835-01-282-9768
NSN 5975-00-113-3657
NSN 5925-01-452-6351
NSN 5915-00-338-8610
NSN 5985-01-469-1412
NSN 5985-01-642-9338
NSN 5975-01-538-8261
NSN 5975-01-593-3130
NSN 5915-01-441-0388
NSN 6620-01-483-1138