The quality Insize Holesaws are compatible with machine and hand drilling. It is best suited to cut various steels, non- ferrous metals, wood and plastic. The Holesaws have varied pitched teeth which allows for greater performance and accuracy. The teeth are electron beam welded teeth ensure stronger long-lasting teeth. Bi-metal Cobalt (M42) is of premium quality allowing greater toughness and longer life of the Hole saws.