Our Hook Eye Turnbuckles are made with quality in mind. Our heavy duty turnbuckles are made with a 5:1 safety rating with a 2:1 proof load test and made of galvanized steel. Galvanized steel turnbuckles have a thick galvanized coating (zinc) which gives the turn buckle added resistant properties. For the ultimate resistance to corrosives, try our stainless steel turnbuckles and other stainless steel hardware. With a hook that has a weaker break strength than an eye or jaw, the assembly has a weaker overall strength than a jaw & jaw turnbuckle or eye & eye turnbuckle. The hook simply allows for a faster connection of the rigging hardware. The galvanized steel turnbuckles meet or exceed the performance requirements of ASTM F - 1145 (formerly Federal Specification FF-T-791). If you need any help with our turnbuckles or other rigging supplies, please feel free to contact our sales staff and they will gladly assist you.