We, Shanghai G&G Industrial Co., Ltd procide Portable Drills Bits Sharpener which is used for grinding twist bits with good quality and low price It has the following advantages: Creative direct current motor instead of traditional alternating current motor; Long-time operation without stopping the machine; Can automatically sharpen 10 different kinds of drills at one time; Low cost but excellent quality; Various kinds of applications: workroom, factory, building industry; Tchnical Parameter: Rated Voltage: 120v/230v Frequency: 60Hz/50Hz Grind Angle:118&＃039; Range of Grinding: 3mm-10mm In Metric:3, 4.5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10mm In British:1/8, 11/64, 13/64, 7/32, 15/64, 1/4, 9/32, 19/64, 5/16, 23/64, 3/8 inch If you are interested, please feel free to contact me. We sincerely hope to establish a long-term business relationship with you. Look forward to your reply.