Crane hook group hook lifting machinery group is the most common type of spreader. Often by means of pulley hook and other parts hanging on the rope hoisting mechanism. Hook according to shape into a single hook and double hook; the production method and laminated into forging hook hook. Single hook create a simple, easy to use, but not the forces, mostly used in lifting capacity of 80 tons workplace; lifting force is often used large symmetrical double hook. Laminated hook by the number of pieces of riveted steel plates cut to shape, the entire hook does not destroyed individual plate cracks, security is good, but the weight of large, mostly used in large lifting capacity or lifting steel ladle The crane. Hook by the impact of the job process often, to adopt the toughness, good quality carbon steel. Classification hook very wide, generally include: shackles, rings, ring, pear ring, long rings, combination rings, S hook, nose hook, American hook claw hook, eye slip hook-shaped, with the insurance card rings screw, chain shackle, unique, innovative, high quality, safety features.