【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 accuracy, and can be installed on electric drills. 【High-quality materials】 Made of cemented carbide head materials, low resistance, high hardness, improve efficiency. work and can maintain a longer cutting time than ordinary steel drill bits. 【U-shaped groove and triangular handle】 The U-shaped spiral is smooth and flat, and the drilling is smoother. The triangular shank design makes the clamping tighter without slipping. 【Spear point design】 This sturdy tungsten carbide tipped drill bit is sharp, easy to locate, stable drilling, fast, does not break the boundary, and the opening is neat 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