User Guide:
* Choose a sutiable size drill bit depend on the woods' hardness level:
- If the wood is a soft one, choose a relatively one size smller drill bit;
- If the wood is a hard one, choose an exact size or a relatively one size larger drill bit;

* Choose a Sutiable Size Drill Bit Depend on the Diameter of the Screw:
- 5/64" bit can drill a hole(hole diameter is 2mm) for screws whose diameter is 2.2-2.8mm;
- 7/64" bit can drill a hole(hole diameter is 2.8mm) for screws whose diameter is 3-3.5mm;
- 9/64" bit can drill a hole(hole diameter is 3.5mm) for screws whose diameter is 4-4.5mm;
- 11/64" bit can drill a hole(hole diameter is 4.5mm) for screws whose diameter is 5-5.5mm;
- 5mm bit can drill a hole(hole diameter is 5mm) for screws whose diameter is 5.5-6mm;
- 13/64" bit can drill a hole(hole diameter is 5.2mm) for screws whose diameter is 6-6.5mm;
- 1/4" bit can drill a hole(hole diameter is 6.35mm) for screws whose diameter is 7-7.5mm;

* What if the drill bit get stucked:
- If the drill bit get stuck and jammed after drilling and you are not able to pull it out, use the L-Shape Wrench to disassemble the drill bit into parts, then you can get the bit out.

What You Will Get:
8 x Self Centering Drill Bits
1 x L-Shape Wrench
1 x Black Plastic Case