... .CE Drill Bit Grinder :Portable idiot drill grinder, twist drill grinder, Universal small drill grinder, universal big drill grinder, universal precision drill ... grind the drill bit's point angle, back angle and front cutting lip(front angle), you also can control the ... light heart. Technical parameters:Grinding range: Φ3-Φ14mmPoint angle: 90°-135°Power: AC220V/180WSpeed: 5300RPMDiamond grinding wheel: ...