The Package Includes:6 Pieces of Dry diamond drill bits kit Material: Carbide drill bit Advantages: Internal sealing wax treatment, beneficial to reduce the temperature of cutting, solid cooling wax, more durable use when dry Punch Diameter: 1/2 inch(12mm), 3/8inch (10mm), 5/16inch (8mm) , 3/16inch (5mm), 1/4”(6mm) Drilling Depth: 30mm Overall Length: 65mm Applicable Materials: drilling glass, ceramic tile, marble, granite, quartz stone, vitrified tile, etc. Kind Tips: 1. Prohibited materials: cement, metal, tempered glass, wood, plastic 2. Vertical hard top and vertical hard pressing are prohibited, otherwise the service life will be greatly reduced 3. It is not recommended to use rechargeable drill / ordinary rechargeable drill / ordinary low-speed hand drill Instructions: 1. Install the drill bit on the hand drill to use 2. The hand drill maintains a high speed throughout the whole process and is inclined at 45. The smaller the strength of the light tile, the less likely it is to slip, and a crescent-shaped positioning groove is formed. 3. After punching out the positioning groove, slowly drill vertically, shaking slightly while drilling, which can make it easier to discharge debris and improve drilling speed and efficiency. (Vertical hard top and hard pressing are prohibited, otherwise the service life will be greatly reduced).