A convenient clamp for woodworking, welding, bonding work, and machine assembly. [Features] Maximum opening 2.5 inches (63 mm); How to Use: For objects you want to fix, rotate the handle to open the mouth and tighten the handle. If the screw part is poorly moved, please lubricate (sewing machine oil). If the object scissors, please use a plaque or other similar material. Please do not use it as a hanging device. Please do not use it as a scaffold when attaching it to a scaffold or object. Please be aware that overtightening may damage the object. Please inspect each part before use and do not use if cracks, scratches, or damage are permitted.