A heavy load cannot be lifted into the air without some degree of danger. To minimize danger, it is important that certain basic factors be given careful consideration when lifting a heavy load. The following outline lists factors which are to be considered when preparing to lift. Included is a series of checklists for the following - worksite, load, rigging, crane, plan, and multiple lifts. Also includes, hoist line shackle and sling weight estimator charts. Perfect for the tool box.