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 and work perfect tools: these heavy duty Mini 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, metal, , jade, gemstones, , pendants, and cobblestone, and so on Groove design: our diamond bits for drill are provided with groove design, which provides convenience for your drilling process, and they are also convenient to clean up debris during drilling, with less heat generation; This design bring you a good use