A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6320-01-334-5305
NSN 5990-01-074-6549
NSN 5915-00-410-8874
NSN 5985-01-435-0694
NSN 5999-01-557-2968
NSN 6645-01-591-3970
NSN 6650-01-378-6868
NSN 6145-01-469-5599
NSN 5950-01-327-2808
NSN 5950-01-569-0504
NSN 6650-00-172-7519
NSN 5999-00-240-2498