Complete Accessories: our package contains a total of 20 pieces twist diamond tip drill bit with 10 different diameters, namely, 0.8 mm, 1.0 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, which can meet your different needs in daily life and work, please attention that the drill tool not included Ideal tools: these heavy duty micro diamond drill bit have pointed enough drill bits, which can bring you a more practical and faster experience, helping you drill holes or polish target objects faster, and save time and effort when using them Applicable object: the diamond encrusted drill bits have precise size and diameter, which can meet your different use requirements, and can be applied for drilling jade, soft metal, agate, jade, gemstones, pearls, pendants, and cobblestone, and so on;Please note: This product is a precision drill bit and is very thin. Do not use it on high-hardness materials such as hard gemstones. Avoid applying excessive pressure or torque to prevent the drill bit from breaking Groove design: our diamond bits for drill are provided with groove design, which provides convenience for your drilling process, and they are also convenient for you to clean up debris during drilling, with less heat generation; This design will bring you a good use experience Reliable material: our diamond drill bits are made of quality diamond material, which have been finely polished and polished.They are strong enough, accurate in size, not easy to rust or deform, and can serve you for a long time Features: Hard drill bits: Our metric sized micro bits for drilling are made of hard diamond. Compared with other metal materials, our tools have the characteristics of high temperature resistance and wear resistance, and can be applied for wood, plastic, soft metal and jewelry. Extensive use scenarios: Our diamond tipped drill bits can drill holes in various materials, which can provide convenience for people in daily production and life. You can use them to make earrings, necklaces, handicrafts, bracelets or watches. Specifications: Material: diamond Color: as the pictures show Size: 0.8 to 4.0 mm in diameter Package includes: 20 x Diamond drill bits Note: Manual measurement, please allow slight errors on size. The color may exist slight difference due to different screen displays. The pointed parts may include, please use it carefully.