How to save life of dull and broken stepped drill bit

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PURROS PG-13J Portable drill bit grinder, stepped drill grinder, automatic drill bit sharpener manufacturer

PURROS PG-13J Portable Stepped Drill Bit Grinder, Grinding Ranges Diameter: Φ4-Φ14, Grinding Point Angle: 118°-140°, Power: 220V/180W

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