Plate Clamps safely lift plate and sheet material in the vertical position. Clamp features a locking mechanism for optimum safety, as operator simply pulls ring to allow easy material release. Forged steel head and gear with hardened steel serrated jaws for long life. Durable powder coat finish. Meets ASME B30.20 specifications. Note: Not designed to use on stainless steel or aluminum plates. For use with materials with a surface hardness to 30 RC (300 HB).