Portable idiot drill grinder, twist drill grinder. 1.Grinding is accurate and rapid, easy operation with no skill to grind. 2.Economical price that greatly reduces the cost and improves the use effect. 3.With diamond grinding wheel, it can be equipped directly with an accurate angle and long service life. 4.The electrically controlled and powerful DC motor: stable frequency, strong horsepower and long service life. 5.Bearing shaft and locking unit. 6.The machine is set up with the function of adjusting a point (central point) size, which can effectively coordinate with the material of drill hole and the rotation speed. It can control the quality precision and prolong the service life of the drill bit.