"Designed for lifting plate material in horizontal position. Not designed for use on stainless steel or aluminum plates. For use with materials with a surface hardness to 30 RC 300 HB. Load Capacity lbs. 2,000, Bale Opening in. 1 3/16, Plate Thickness in. 0.8125, Throat Depth in. 3 3/8. Designed for lifting plate material in a horizontal position Heavy-duty steel construction for years of reliable use Meets ASME B30.20 specifications Do not use plate clamps to lift loads less than 20 of rated capacity. Lift only one plate at a time. Plate must be clean and free of oil"