The Grainger 14N978 is a 14-inch diameter, high-speed steel hole saw designed for cutting holes in wood, plastic, and light metals. It has 18 teeth and a 1/2-inch arbor size to fit most drill chucks. The bi-metal construction combines high-speed steel teeth for durability and carbon steel backing for strength. It can cut holes up to 4-1/8 inches deep and is ideal for use with portable drills. The hole saw allows for fast, clean cuts and is made in the USA.