It is extremely hard to correctly sharpen a drill bit by h&. this drill bit sharpener from tormek makes it possible to sharpen drill bits on your tormek water cooled sharpening system with the highest precision. unlike conventional drill bit sharpeners, tormek sharpens with water cooling which is gentle on the steel. overheating of the steel is usually not noticeable, but the consequences are that the drill will dull rapidly & may even break. The attachment can be set at any point angle between 90 deg & 150 deg & at four different clearance angles. this flexibility enables you to give the drill the geometry that works best for each drilling operation.