80mm Serrated Hollow Core Diamond Drill Bits Hole Saw for Glass Tile Stone 1000 Grit Made of carbon steel with

Made of carbon steel with an anti-dust and waterproof surface

secure connections and rapid transmission

and other wood crafts

electronic modifications

die-cast aluminum

80mm Serrated Hollow Core Diamond Drill Bits Hole Saw for Glass Tile Stone 1000 Grit Made of carbon steel withThe serrated drill bit increases the sharpness and opening speed. Sharper and more durable than ordinary electroplated drill bits, especially suitable for thick glass openings. (10mm thick glass generally has about 300 openings.) Using electroplated diamond (50 60 grits), the opener creates precise, smooth cuts with no broken edges. Nickel plating improves hardness, wear resistance, corrosion resistance, and greatly extends the drill bit life. Low