This is for two (2) quality marine grade stainless steel (AISI 316) 5/16" UNC turnbuckles with eye and eye. Each turnbuckle is stamped with the grade of 316 and the size of 5/16". Each turnbuckle comes with a locking nut on each end. 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. Breaking Load 4620lbs. Working Load Limit 1150lbs.