General description Tile Drill Bit Set includes 10 pieces of high-efficiency glass and ceramic drill bits designed for drilling holes in various materials such as glass, ceramic tiles, concrete, iron, brick, marble, and wood. The set features a double spiral design that allows for quick chip removal, preventing stagnation and increasing cutting efficiency. Technical specifications Includes: 1x 3mm, 1x 4mm, 2x 5mm, 2x 6mm, 2x 8mm, 1x 10mm, 1x 12mm drill bits Hex shank for secure fitting Installation Do not use hammer drills or impact drills to avoid reducing the life of the drill Recommended drilling speed: 90° low speed Ensure the surface of tiles and glass is cooled with water during drilling to prevent burning Reposition the drill if it hits reinforcing steel when drilling into walls to avoid chipping the cutting edge Usage Moisten the soldering iron tip with water to extend its life Use the drill for high efficiency soldering for better results Not recommended for use with 2 x 4r