Milwaukee Arbor w/ Retractable Starter Bit precise centering with its large arbor design, making it easier and faster to cut tile, stone, and glass. This retractable starter bit works seamlessly with Diamond Plus™ threaded hole saws, allowing you to cut clean and accurate holes without the need for pilot holes. Diamond Plus™ hole saws provide -in-class performance and the lowest cost per hole, boasting up to 10 times longer life. The durable retractable starter bit enhances productivity when working with hard, abrasive materials, and its large arbor fits hole saws 1-1/4 inches and larger. Model Number: 49-56-7135