This is for ten (10) quality marine grade stainless steel (AISI 316) M6 turnbuckles with eye and eye. Each turnbuckle is stamped with the grade of 316 and the size of 1/4" (6mm). 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 2860lbs. Working Load Limit 715lbs.