This universal drill bit set is suitable for use with your lithium electric drills, hand drills and bench drills. It is suitable for drilling holes in a variety of materials, such as wood, glass, ceramics, etc., and is a perfect helper for your daily work. If you need it, come and try it, it will not disappoint you. Features: It is made of alloy material, which has higher hardness than ordinary, and is more wear-resistant and has a longer service life. The resistance of the incision is smaller, the punching is more precise and more labor-saving , the removal of wood chips when drilling is more efficient and the use is perfect. Suitable for many different materials, such as wood, plastics, foam brick, vitrified brick , glass and other materials, has many applications. These drill bits should be used with electric drills, hand drills and bench drills whose clamping range is less than 10mm. br/>The drill bit shank is cut into a solid hexagon, so that the electric drill is clamped more firmly and the drill is not easy to slip when using, gives you a better working experience. use. Specifications: Material: alloy Type?:?Type1~5 (optional) 3mm?: Working length: 33mm Total length: 70 mm 4 mm?: Working length: 35mm Total length: 70 mm 5 mm?: Working length: 40mm Total length: 76 mm 6 mm?: Working length: 42mm Total length: 77 mm 7 mm?: Working length: 48mm Total length: 80 mm 8 mm?: Working length: 48mm Total length: 80 mm 10 mm?: Working length: 55mm Total length: 83 mm 12 mm?: Working length: 55mm Total length: 83 mm Package size: 110*58*12mm/4.3*2.3*0.5in Package Weight: Type1: 83.3g/2.9oz Type2: 115 g / 4.1 ounces Type3: 116 g / 4.1 ounces Type4: 126g/4.4oz Type5: 128.4g/4.5oz Packing List: Type 1: 1 * 3mm Bit 1 * 4mm Bit 1 * 5mm Bit 1 * 6mm Bit 1 * 7mm Bit or Type 2: 1 * 5mm Bit 1 * 6mm Bit 1 * 8mm Bit 1 * 10mm Bit 1 * 12mm Bit or Type3?:< /strong> 2 * 6mm Bit 1 * 8mm Bit 1 * 10mm Bit 1 * 12mm Bit or Type4?: 1 * 4mm Bit 1 * 5mm Bit 1 * 6mm Bit 1 * 8mm Bit 1 * 10mm Bit 1 * 12mm Bit or Type5?: 1 * 5mm Bit 2 * 6mm Bit 1 * 8mm Bit 1 * 10mm Bit 1 * 12mm Bit