"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. 400-Lb. minimum uniform plate weight. Product Style Horizontal, Throat Depth in. 3 3/8, Bale Opening in. 1 3/16, Plate Thickness in. 13/16, Load Capacity lbs. 2,000. 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"