Material The micro drill bits are made of high quality carbide and have high quality hardness and performance. High strength ensures their long-term use. Dimensions 10 drill bits, respectively: 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm and 1.2mm. This drill kit offers a wide range of operations to meet a variety of needs. Features With sharp edges, our circuit end spiral groove printed reduces cutting effort, improves hole accuracy, prevents damage to drill bits and improves drilling accuracy. Handle Our mini drill bit for printed circuit board has a sturdy handle of approximately 3.175 mm (1/8 inch) and is coated with silicone for easy drilling. They are perfect for circuit boards, bakelite, CNC, engraving, plexiglass, jewelry, plastics and other precision drilling. Packaging Packed in plastic boxes to make it safe, clean, tidy and easy to find. It is easy to carry and protect the drill bit kit and bring it to the workshop and other work points. Tips: 0.3-1.2mm drill bit is easy to break, adjust it gently, do not use brute force to remove the drill bit. Game Cemented Carbide Micro Drill Bits ---A variety of sizes, a variety of uses, it is a good choice for your drilling operations. High quality cemented carbide The micro drill bit is made of high quality cemented carbide, which has sufficient resistance to bending and wear. Can be used for a long time. Smooth surface The well-polished surface is quite clean and tidy, and there are no defects or burrs on the handle. 10 drill bits of different sizes Set includes 10 positions ranging from 0.3 mm at 1.2mm and is divided into ten colors, which is enough to distinguish different specifications. It can meet a variety of different usage needs. Multiple uses --They are ideal for printed circuits, bakelite, CNC , engraving, plexiglass, jewelry, metal plastic and other precision drilling. Specification: Material: tungsten carbide Quantity: 10 PCS Silver Size: 9*5.4*1 cm Shank diameter: 3.175 mm (1/8 inch) Weight: 40g Package includes: 1 * Mini Drill Bit Kit (10pcs) Notes: When drilling holes , be sure to clean the surrounding dust when filming, and take protective measures to prevent dust from entering the eyes. Due to manual measurement, please allow an error of 1-3mm Objects are small and sharp, please keep them away from children. Delivered quantity: 10 pieces