Vertical plate clamp heavy-duty plate clamp is designed to vertically lift and turn plate material from all positions. Lifting clamp includes an articulating shackle for versatile, smooth operation and automatic serrated hardened steel pads and cams. Clamp features a safety mechanism that ensures the clamp does not slip when lifting force is applied or when load is lowered. Drop-forged carbon steel case offers maximum strength. Meets asme b30.20 specifications. Note: not designed to use on stainless steel or aluminum plates. For use only with materials with a surface hardness below hrc 30 hb 300, brinel 1300.