【7 Dimensions】The drill bit set has 7 different sizes: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm. These glass drill bits are perfect for various drilling tasks with high drilling precision and can be installed on electric drills. 【High-quality materials】 Made of aluminum, cemented carbide head materials, low strength, high hardness, improve work efficiency and can maintain a longer cutting time than traditional steel drill bits. 【U-shaped groove and triangular handle】 The U-shaped spiral is smooth and flat, and the drilling is smoother. The triangular shaft design makes the clamping more firm without slipping. 【Lance tip design】This heavy-duty drill bit with tungsten carbide tip is sharp, easy to locate, stable when drilling, fast without breaking the limit and the opening is clean and smooth. 【Widely used】The drill bit set is suitable for drilling ceramic tiles, concrete, ceramic tiles, bricks, wood, plastics, glass, masonry and other materials. It is widely used in home decoration, manual