Shackles are one of the most versatile, important pieces of equipment in nearly every rigging, lifting and material handling operation becasue they serve the critical function of connecting various pieces of lifting equipment together. A single shackle can weigh anywhere from an ounce to over four tons and can lift loads exceeding 1,500 metric tons - an achievement that crowns the shackle king among the realm of lifting and rigging equipment. Such a powerful piece of equipment requires proper handling and knowledge in order to unleash its full potential.