This is for one (1) quality marine grade stainless steel (AISI 316) turnbuckle (or open body) hook and eye with locknuts. This turnbuckle is designed to adjust tension or length in ropes, cables or other tensioning systems. Each turnbuckle is stamped 3/8" (the size) and 316 (the grade). This is a 3/8" UNC thread. The metric equivalent is generally considered to be 10mm. 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.
