A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5975-01-653-5042
NSN 6240-01-481-1796
NSN 5905-01-273-2510
NSN 5999-01-282-5226
NSN 4140-00-126-0247
NSN 6620-01-483-1138
NSN 6610-00-740-7103
NSN 5960-00-424-9648
NSN 5975-00-105-8858
NSN 5915-01-555-8081
NSN 2925-01-324-3533
NSN 6150-01-298-6878