The Grainger 157H14 is a 14-inch diameter, high-speed steel hole saw with a 1-1/8-inch arbor hole and 1/2-inch shank diameter. It has 14 teeth per inch and is designed for cutting holes in wood, plastic and soft metals. The bi-metal construction provides durability and longevity. Overall length is 5 inches. Recommended operating speed is 1300 RPM with light pressure. It can be used with power drills, drill presses and hole saw arbors. This quality hole saw is made in the USA.