This is for one (1) quality marine grade stainless steel (AISI 316) 1/2" Whitworth lifting eye nut. Each bolt is stamped 316 and 1/2" (for the size). The pitch is 12. The bolts are manufactured in the Imperial style of 1/2" Whitworth. 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.