The hook shall be free of defects that may affect the safe use performance; The hook defects shall not be repaired by welding; The surface of the hook shall be smooth and free of cracks, folds, acute angles, burrs, peeling, burning and other defects. Two suitable positions can be selected at the shortest distance of the hook opening to print signs that are not easy to wear, and the distance of the signs can be measured as the basis for detecting whether the opening degree changes during use.

The hooks are widely classified, generally including shackles, lifting rings, rings, pear shaped rings, long lifting rings, combined lifting rings, S-hooks, nose hooks, American style hook and claw hooks, eye shaped slip hooks, elevator screws with safety clips, chain shackles, which are unique, novel, high-quality and safe, and are suitable for factories, mines, petroleum, chemical and ship terminals. Ensure safety, quality safety factor, and the static load reaches 3 times. The lifting capacity ranges from 5 tons to 150 tons.