A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6650-01-358-9800
NSN 6320-01-006-6138
NSN 6130-01-044-5436
NSN 5998-01-208-2864
NSN 6150-01-434-1891
NSN 6620-01-406-3584
NSN 5999-00-081-3519
NSN 6320-01-338-5950
NSN 4140-01-092-0807
NSN 6135-01-515-6600
NSN 5975-00-189-7849
NSN 2925-00-793-9660