Features: 1.HIGH-QUALITY MATERIALS It is made of high quality YG6X alloy as raw material. The process of oxynitriding of the cutter head strengthen the drill hardness. 2.SURFACE ELECTROPHORETIC PAINT PROCESS Full-grinding and anti-rust treatment, clean and sharp without burrs .The drill bit is more wear-resistant and more durable .Fully automated polishing: Polished CNC is fully automated, each one is unified. 3.UNIQUE CROSS ANGLE DESIGN Small incision resistance,feature drilling stably, fast speed, not breaking the border. Opening neat, smooth, no broken edges, no tremor phenomenon, chip easily. 4.WIDE USAGE Professional glass and tile drill bits provide smooth and accurate drilling in ceramic tiles, marble, thin iron plate, mirrors and glass. Remember to add Water or coolant when drilling. 5.DIFFERENT SIZES Suitable for your different needs.It Can be installed in the general electric hand drill, bench drill. The machine drill clamp range is 10mm and above. Specifications: Material: Cemented Carbide Bit Type: Tile & Glass Drill Bit Coated: Titanium Drill diameter: 3mm/4mm / 5mm / 6mm /7mm/ 8mm / 10mm / 12mm It has strong toughness and wear resistance Incision resistance are small, increase the opening speed, long service life Industrial grade Coated Carbide Point with 4 Cutting edges Can be installed in the hand drill, electric drill Suitable for Ceramics, granite, tiles, stone, wood, plastic,concrete wall to drilling hole Package Includes: 1set of 5 pcs Drill Bit Warm Tips: 1.Due to the light and monitors effect, colors may have lightly difference. 2.Please allow slightly size errors due to manual measurement. Thank you for your understand! 3.1mm=0.039inch. Thank you for your attention, if you want buy more than we listed, please contact us.Welcome to visit.Hope you have a nice day! _x000D_