Competitive Price, Easy to Use, and Simple in Structure Tool Grinding Properties: able to grind 2-slot twist drill, material of drill as quick cutting steel, tinning drill, cobalt-plated drill, parabola drill, drill with taper shank, hard alloy drill (diamond grinding wheel to be selected). The length of drill shank is not limited, and the tool grinding quantity can be adjusted. Maintenance of Grinding Wheel: Coolant is not required. The grinding wheel is of super-tolerance to abrasion and electroplated type, without the need for calibration or repair. Operating Time: Under normal situation, too grinding can be completed with one 3mm drill within 15 seconds, and with one 19mm drill within 60 seconds.