This is for one (1) quality marine grade stainless steel (AISI 316) M8 turnbuckle closed body rigging screw with jaw and jaw. Each turnbuckle is laser etched with the grade of 316 and the size of M8. The imperial equivalent is generally considered to be 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 4840lbs.