Professional Diamond Hole OpenerMade of selected high strength carbon steel and diamond coated drill bit, excellent cutting ability, anti-rust and durable, high torque and long service life. < p>High-quality hole drillingDiamond coating can increase the drilling speed and make the drill sharper. The tip design makes the resistance smaller and more efficient, helping you drill a smooth round hole precisely. Round chip hole on the side to keep the drill clean at all times. Great forDiamond brazing specially designed for porcelain, glass, marble, ceramic, rock and granite , etc. Usage TipsFirstly, you can cut a 45 oblique, open the positioning crescent groove, then slowly erect the hole opener and drill to a uniform speed. Additionally, keep the bit moist when drilling to avoid overheating Diamond Drill Bit This diamond core bit removes a full circle of glass, tile, marble, granite, ceramics or other materials. Made of high-strength carbon steel, sturdy and durable, with excellent anti-rust performance, it can be used for a long time. The design of the cutting hole is matched with the round chip hole on the side to effectively increase the drilling speed and keep the bit clean. Clearance hole The Diamond drill bits with clearance hole facilitate the entry of cooling water and the evacuation of chips when drilling. This makes the drilling process easier. U-groove design Helps remove debris and improve drilling efficiency. The grains of High-quality diamonds allow faster drilling and a better finish. Hexagonal shank Hexagonal shank design for more stable drilling. Technology Vacuum brazing minimizes breakage and ensures greater longevity. Material: high strength carbon steel Size: 35mm Package includes: 1Pcs x Diamond Hole Saw Drill Bit Please note Always use water for lubrication, otherwise the diamond drill bit will burn. Can be used with a standard electric drill. Make a half-round mark, then hold the drill upright. Reduced drilling speeds, low drilling pressure and increased use of lubrication water will significantly extend the life of the bits. Use coolant. Minimum pressure. For drilling granite, marble, masonry, concrete, tile, ceramic, hard plastic, etc. As a general rule, the smaller the drill bit diameter, the higher the drilling speed. The harder the material, the slower the drilling speed should be. If you smell burning, back off! Either your speed is too high or the pressure you are applying is too much. Your wick should never be hot to the touch, not even lukewarm.