Features 【High Quality】PCB drill bit is made of high quality tungsten steel, with high wear resistant, high hardness, bending strength, loss resistant, and high working efficiency. 【Multiple Size】This group contains 10 micro twists bits diameters of different sizes: 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.7mm, 0.8mm, 0.9mm, 0.9mm, 1mm, 1mm, 1mm, 1.1 mm, 1.2mm, 1.2mm, each size has 5 PCs. 【High Precision】Tip, molar and clean surfaces, these micro drill bits work quickly and cleanly without glitches or scratches. 【Application】2.1-3.0mm spiral flute cnc router bits are suitable for 3D printer nozzle cleaning, amber beeswax, circuit boards, Becrete, CNC engraving plexiglass, jewelry, metal plastics and other precision drilling. 【Good Packaging】The small drill bits comes with high quality plastic box, easy to carry and better protections packaging can damage the blade tip during delivery. 1. The twists drill bit of tungsten steel has high hardness and wear resistant, which can avoid breaking during use. 2. twists drills have incisive cutting edges and large spiral grooves, which make it easier to remove chips and make holes easier anan reduce the debugging time of the machine and achieve precise and rapid drilling. 5. Can be used on printed circuit board drill machine, carving machine, CNC and other high accuracy special drilling equipment. Specification: Item Type: Micro twists Bits Material: Tungsten steel Specification: 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm Package List: 10 x Micro twists Bits Package List 10 x Micro Twist Bits