[7 Sizes] There are 7 different sizes of drill bits: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm. These glass drills are very suitable for various drilling tasks, with high drilling accuracy and can be installed on electric drills. [High-quality material] The use of cemented carbide drill bit material has low resistance and high hardness, improves work efficiency and maintains a longer cutting time than ordinary steel drill bits. [U-shaped groove triangle handle] The U-shaped spiral is smooth and flat, making drilling smoother. The triangular handle design makes the clamping tighter without slipping. [Spear Point Design] This sturdy carbide-tipped drill bit is sharp, easy to locate, stable drilling, fast, does not exceed the limit, and the opening is neat and smooth. [Wide Use] The drill is suitable for drilling ceramic tiles, concrete, ceramic tiles, bricks, wood, plastic, glass, masonry and other materials. It is widely used in home decoration, manual DIY and other scenes. Delivery