Precise Grinding Results , Precision Assurance within 0.02mm,Easy to Operate , grinding a drill within 10 seconds. Special Design High Accuracy Alloy Steel Collets,Accurate Grinding consumption 0.2mm High Efficiency DC motor,Stable Quality GE Diamond Dust Grinding Wheel Considerable Design, Invisible Tool Box, Delicate & Friendly Use,Portable Design with only weight 8 kgs.