This is for one (1) quality marine grade stainless steel (AISI 316) turnbuckle (or bottlescrew) jaw and jaw. Each turnbuckle is laser etched with the size of 5/8" and the grade 316. This is a metric turnbuckle with M16 threads, the imperial equivalent is 5/8". A locking nut is supplied 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.