This is for two (2) quality marine grade stainless steel (AISI 316) Bow Type 80704 US Shape M6 lifting bow nuts. Each nut is stamped 316 and M6 (for the size). The bolts are manufactured in the metric style of M6 or 6mm. Not to be used for overhead lifting. AISI 316 stainless is a premium grade of stainless and is considered by many to be best in class. 316 stainless is corrosion resistant and very durable even in the harshest of conditions for a long service life.