A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5965-01-595-9498
NSN 6150-01-643-3657
NSN 5998-01-163-5558
NSN 5999-00-926-3241
NSN 6220-00-511-3934
NSN 5915-00-010-0635
NSN 5925-01-272-0894
NSN 5965-01-267-8536
NSN 5855-01-278-8922
NSN 6130-01-203-1955
NSN 5935-00-924-4006
NSN 5999-00-217-9976