Check the listing for details. Drill Bits Sharpener, 3-20mm Grinding Machine, Lip Relief Angle & 95°-135&#. Condition: New. Listed at 580.80 USD. Drill Bits Sharpener, 3-20mm Grinding Machine, Lip Relief Angle & 95°-135° Point Angle Adjustable Drill Bit Re-Sharpener, Portable Sharpening Machine with 18 Collets, MR-20G. High-precision Sharpening: MR-20G drill bits sharpener excels at sharpening point angle and lip relief angle.