Lifting and hoisting tools include: elastic tensioner hooks, wire ropes, slings, lifting chains, lifting straps, lifting ropes, lifting skids, etc. Now let's talk about hooks: hooks can be manufactured separately into forged hooks and debris hooks according to the manufacturing method. Forged hooks can be divided into single hooks and double hooks. Single hooks are usually used for small lifts and double hooks are usually used for larger lifts. Chip hooks also have a hook and a double hook. Tensioner classification (1) single hook: This is a commonly used hook. Simple structure, easy to use. The material is generally made of 20 # high quality carbon steel or 20Mn, and the weight does not exceed 80 tons. (2) Double hook: When lifting a large weight, use double hooks, the force is uniform and symmetrical. Eccentric buckle type material is generally made of 20 # high quality carbon steel or 20Mn, lifting equipment of more than 80 tons is usually double hook.