A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5999-01-258-5459
NSN 5945-01-480-0484
NSN 5998-01-563-1627
NSN 6685-01-013-6499
NSN 5910-01-525-7733
NSN 5999-00-089-0414
NSN 5915-00-432-9284
NSN 5999-01-464-9604
NSN 6130-01-289-8051
NSN 6220-00-647-3096
NSN 6150-01-326-1844
NSN 6145-00-233-9146