This is for two (2) quality marine grade stainless steel (AISI 316) M6 heavy duty lifting eye nut. Each nut is stamped 316 and M6. The nuts are manufactured in the US style of 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.