A cold chisel is a hand tool that is primarily used for cutting and shaping metal or other hard materials such as stone or concrete. It consists of a flat blade with a sharp cutting edge at one end and a handle at the other end.Cold chisels are typically made of hardened steel and come in various sizes and shapes to suit different cutting and shaping needs. They can be used with a hammer to chip, cut or shape hard materials, such as concrete or metal.