High quality Rapid Clamps-Wedge Clamps-Column clamps are made of high carbon steel with malleable iron castings to promote long life and many reuses. The units are identical, no right or left, up or down. The clamp is used for setting up the wooden or steel framework for concrete casting. It is used in pair on opposite sides of shutter to hold the tie-rod. The offered Rapid Clamps-Wedge Clamps-Column clamps are very efficient and made for industrial uses.