Eye nuts (eyenuts) are fasteners with a looped head. They are designed to receive a hook or rope. Eye nuts are rated for different types of applications and are oval or round in shape.  Load-rated eye nuts are designed for vertical lifting, but are not recommended for use with angular lifts. Eye nuts that are not load-rated are designed for use with tie downs and guiding wires. They are not rated for lifting applications. Specifications for eye nuts include maximum load capacity, bell diameter, threaded length, inside diameter or width, eye section, and weight. Maximum load capacity is the maximum load which an eye nut can handle. Bell diameter is a measurement which refers to the part of the eye nut that contains the tap. Although most eye nuts are threaded, untapped eye nuts are also available. The inside diameter or width (bail size) is defined as the bail diameter for round eye nuts, and the bail width for oval eye nuts.