【7 Sizes】The drill bit set has 7 different sizes: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm. These glass drill bits are very suitable for various drilling tasks with high drilling precision and can be installed on electric drills. 【High-quality materials】Made of high-quality steel head materials. Carbide, low strength, high hardness, improves 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 ensures a firmer clamping without slipping. 【Lance tip design】This sturdy tungsten carbide tip drill bit is sharp, easy to locate, stable, fast, does not protrude beyond 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 DIY and other