This set of gemstone drilling is a must-have for anyone looking to expand their jewelry-making skills. With its durable construction, you can be sure that these will last for years to come. The sturdy bits are intended for faster punching process for diamond and rocks. Perfect for beginners, DIY lovers and skilled people to complete handmade carving making projects. Features -Color:Silver -Material:Emery -Size:4.30X0.20X0.20cm/1.69X0.08X0.08in -Suitable for both professional jewelers and hobbyists, this tool is a must-have for anyone who works with stones. -The convenient size makes this tool compatible with most electric grinding , making it a versatile addition to any workshop. -Made from durable materials, this tool is built to last and can withstand frequent use without losing its effectiveness. -Whether you're working with jade, amber, or other precious stones, this tool is the perfect choice for expanding holes and achieving precise results. -With enough quantity, when one is broken, and you can quickly replace the old one. Package list: 20 x drill bits