A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6220-01-421-4448
NSN 6130-01-324-1253
NSN 5915-01-328-8563
NSN 6685-01-352-3204
NSN 6650-00-981-9501
NSN 6220-01-357-9507
NSN 5925-00-896-0350
NSN 6685-01-534-2785
NSN 5999-01-245-1332
NSN 5990-01-076-6858
NSN 5855-01-490-4643
NSN 5920-01-441-0362