Turnbuckle Eye Hook meet the performance requirements of ASTM Specification F1145-05 and Federal Specifications FF-T-791B- Type1, Form 1, Class 6 and have a safety design factor of 5 to 1. Made from Drop-forged Carbon Steel for durability and Hot Dip Galvanized to ASTM A-153 for corrosion and weather resistance.Turnbuckle eyes are elongated, maximizing ease of attachment and minimizing stress. This Turnbuckle Eye Hooks are recommended for in-line or straight pull applications only.