Using the Overhead Load Lifters is easy. First, make sure the overhead lifting crane is in good working condition. Attach the lifter to the crane properly. Adjust the height position according to the size of the load you're going to lift. If you're using the adjustable fork models, set the fork width as needed. When lifting, the adjustable bail will help keep the load level. Just be careful to keep the load stable and avoid sudden movements. For maintenance, regularly check the welded parts for any signs of damage or wear. Clean the painted finish to prevent rust. Also, make sure to follow all safety instructions provided by the manufacturer. Remember, all measurements are approximate, and there may be slight variations, so always double - check before use.