"Vertical plate clamp features pivoting bale for easier and more versatile operation. 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. 4,000, Throat Depth in. 2.9, Plate Thickness in. 1, Bale Opening in. 2.3. Pivoting bale for easier and more versatile operation Automatic serrated hardened steel cams and pads Drop-forged steel case for maximum strength Designed to meet ASME B30.20 Warning Do not exceed the working load limit. Serious bodily injury or property damage may result 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"