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I make a very useful tool in this video. We all use Countersink Drill Bit. It is possible to buy for cheap, but can not we do it ourselves? I wanted to try it and decided to do it. For 4mm drill bit, I started by cutting a 12mm bolt. Then I used a file and gave it the shape I wanted. In the end, something good appeared. I even did the second one, I made for a 3mm drill bit from an 8mm steel bar.
If you want the screw heads to fit properly, you should drill a pilot hole with a Countersink Drill Bit. Whether you buy it or do it yourself, use Countersink Drill Bit. If you want to make it yourself, just watch this video.


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You can use it both to drill 90 degree holes and to drill holes in the depth you want. It also works for joining two woods together, you can see in the video.

I make a very useful tool in this video. We all use Countersink Drill Bit. It is possible to buy for cheap, but can not we do it ourselves? I wanted to try it and decided