This tungsten steel drill bit is mainly suitable for high precision professional drilling equipment such as PCB drilling rigs.
PCB Drill Bits Set are great for punching at printed circuit boards, 3D Printer Nozzle Cleaning, CNC engraving plexiglass, Amber beeswax, bakelite, jewelery, metal plastic and other precision drilling.
The Circuit board drill bits also for cutting and engraving and worked on Acrylic, PVC, Nylon, Resin, Fiberglass,etc.

The PCB Drill Bits are made of high quality tungsten steel, highly wear resistance, high hardness, bending strength, anti-impairment, highly working efficiency.
Seismic design on the blade edge enables it to stay stable during engraving.
PCB Drill Bit With sharp cutting edge, milling groove and clean surface, these sets of tool work quickly and cleanly, no glitches or scrap left.
Package with high quality plastic box, easy carry and better protection keeps the blade tip goods in the delivery from being damaged.

Material: Tungsten Steel
Quantity: 5 Boxes (50pcs); 5pcs each size.
Each box contains 10 different Drill bits: 0.3mm+0.4mm+0.5mm+0.6mm+0.7mm+0.8mm+0.9mm+1.0mm+1.1mm+1.2mm

Package Included:
5 x 0.3mm PCB Drill Bits
5 x 0.4mm PCB Drill Bits
5 x 0.5mm PCB Drill Bits
5 x 0.6mm PCB Drill Bits
5 x 0.7mm PCB Drill Bits
5 x 0.8mm PCB Drill Bits
5 x 0.9mm PCB Drill Bits
5 x 1.0mm PCB Drill Bits
5 x 1.1mm PCB Drill Bits
5 x 1.2mm PCB Drill Bits

Note:
1) PCB drill bits which below 0.5mm are easy to break because they are small and thin. It is recommended to be careful when using them.
2) Don't use on too hard material,like high hardness iron.
3) You must apply force evenly and vertically while using. Do not touch the blade with your hands or external force to avoid damage.