High Quality: The PCB drill bits set are made of high-quality, which is high wear resistance, high hardness, anti-impairment. Seismic design on the blade edge enables it to stay stable during engraving. Various Sizes: 1/8 Inch shank; bits diameter: 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5m, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm. This Set contains 30 different size drill bits diameter, each size having1 pcs. Advantage: With spiral flute cutting edge, these PCB drill bits can reduce cutting force and prevent the drill from broken and improve accuracy. They work quickly and cleanly, with no glitches or scrap left. Application: Suitable for amber beeswax, printed circuit boards, 3D printer nozzle cleaning, Acrylic Glass, bakelite, CNC engraving, jewelry, plastic, and other precise drilling. 30-piece Combo Set: There are 3 sets of drill bits (Set A: 0.1mm-1.0mm; Set B: 1.1mm-2.0mm; Set C: 2.1mm-3.0mm), each of 10 pieces, and each set has a protective box. It's easy to store and carry. Color: Random colors, do not accept specified colors Material: hard alloy + white steel Package Contents: 1 set * PCB Drill Bits (0.1mm-1.0mm) 1 set * PCB Drill Bits (1.1mm-2.0mm) 1 set * PCB Drill Bits (2.1mm-3.0mm) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.