A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5925-00-831-8882
NSN 7035-00-134-3143
NSN 6220-01-199-2512
NSN 6150-00-303-1565
NSN 6685-00-642-0533
NSN 2925-01-533-7904
NSN 7035-01-632-3449
NSN 5999-01-277-5299
NSN 5990-01-584-8363
NSN 5895-00-731-9997
NSN 6645-01-290-3930
NSN 5960-00-860-7709