This hardened steel drill driver is essential when using our technique of filing tone holes with a drill. Drill filing tone holes is the fastest and most accurate method of leveling saxophone tone holes. As this tool is seldom straight from any manufacturer we take time to straighten each one before it ships to you. Use this drill driver with the JS Tone Hole Files and Ultimax Medium key oi. Use the 3 inch driver for the palm and side keys as well as the top stack. The longer drill driver allows for clearance around the bell when filing tone holes on the bottom stack.