Total sharpening time for each bit averaged less than 2 minutes. What our tester says: “I usually prefer multipurpose shop tools, but drill bits can be tricky. A simple calibration system and ...

Try an in depth-television infomercial. Professional Tool Manufacturing's infomercial for Drill Doctor, a drill-bit sharpening machine, is one of the longest-running infomercials in TV history. It has ...