This is for one (1) quality marine grade stainless steel (AISI 316) 5/8" UNC heavy duty lifting eye nut. Each nut is stamped 316 and 5/8" (for the size). The nuts are manufactured in the US style of 5/8" UNC. 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.