Uxcell 30mm Serrated Hollow Core Diamond Drill Bits Hole Saw for Glass Ceramic Tile Stone

The 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 drilling resistance continuous cutting edges high precision little or no chipping. Widely used for cutting accurate holes on glass ceramics porcelain ceramic tile porcelain tile limestone slate marble light stone and fiberglass. Not suitable for drilling tempered glass plastic and wood. Use on ordinary hand drills or bench drills. Always work with coolant (water) when drilling. Not suited for use on concrete or for depths beyond about 1/2-inch. Notice: Start your hole diagonally make a round trace and then hold drill straight. Use at low drill speeds and drill pressure.