14-gauge by 3/4" long bronze "ring shank" nails.  Used for fastening kayak decks or in other marine carpentry applications.  The "teeth"---the annular rings referred to in the name---yield amazing holding power.  Solid bronze fasteners are handsome beneath epoxy and varnish.  

-- 8-ounce bag contains about 350 nails.  

-- 16-ounce bag contains about 700 nails.