Vertical plate clamp heavy-duty plate clamps are designed to vertically lift and turn plate material. These lifting clamps include a pivoting bail for versatile, smooth operation and automatic serrated hardened steel pads and cams. Clamps feature a drop-forged steel case for maximum strength. 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).