... Grinder: 1.Drill grinder, easy operate, accurate and fast. 2.With diamond grinding wheel, long service life. 3.CE Drill Bit Grinder ... and improves the use effect.3) With diamond grinding wheel, it can be equipped directly with an accurate angle and long service life ... random instead of centre drill, escape of chips easily, drilling with a light heart. Technical parameters:Grinding range: Φ3-Φ14mmPoint ...