5/16 Inch x 4-1/2 Inch Hot Galvanized 1030 Carbon Steel Hook and Eye Turnbuckle.With many uses and applications, turnbuckles are designed to take up slack and apply tension. Typical industrial turnbuckles are available in 5 basic styles eye x eye, eye x hook, hook x hook, jaw x jaw and jaw x eye. Turnbuckles are made up of the main body and 2 end connections. the inside length of the turnbuckle body determines the length that end fittings can move inward and outward. Sizes are referred to by the diameter of the threaded