High QualityThe PCB Drill Bits are made of high quality tungsten steel, highly wear resistance, high hardness, bending strength, anti-impairment, highly working efficiency. Multi SizeThis Set contains 10 different size drill bits diameter: 0.3mm, 0.4mm, 0.5mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1mm, 1.2mm, each size have 5 pcs. High Precision With sharp cutting edge, milling groove and clean surface, these sets of tool work quickly and cleanly, no glitches or scrap left. ApplicationGreat for 3D Printer Nozzle Cleaning, Amber beeswax, circuit boards, bakelite, CNC engraving plexiglass, jewelery, metal plastic and other precision drilling. Pay AttentionSince the picture1 (blue box) is easily be damaged during transportation, our real package is 5pcs white plastic box, as you can see in picture7, with which can be easily carried and better protection keeps the drill bits in the delivery from being damaged.