Single hook manufacture simple, easy to use, but not by force, mostly in the weight for 80 tons below the workplace, Using force plays a big weight often entangle symmetrical. Stacked hook from several pieces of steel rivet and cut into individual plank, when the hook won't crack damage, safety, but mostly used in large, weight lifting weight or large hoisting bucket crane steel bowls. Hook in process middling impact toughness, good quality, using carbon steel manufacturing.
Wrought iron lifting hook: hoisting machinery in one of the most common sling.