The absolute master of drill bit sharpening is Drill Doctor. They have sold millions of these units over the past decade, and no company out there, big or small, has been able to manufacture a quality unit like the Drill Doctor at a similar price. The grinding wheels and bit chucks their units use will produce unbelievable results for your bits. These are the number 1 drill bit sharpeners in the world, by far. JB Tool has proudly distributed these units for years and has never had an unhappy customer.