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The drill square holes (4 photos 1 SIFCO)

Have you ever asked yourself the question, what to do with the help of the square holes than how?
It can be a long time guessing better once to see.









That is the secret of why the triangular drill


drill hole
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Ant farm. Ant Farm
...
Master class for the preparation of insects (10 photos)
...
John Galliano
...
Behind the scenes
...
Annual rings
...
Did you ever ... (24 pics + text)
...
Life situations
...
Brain tricks
...
19 revelations pilots and their assistants, revealing secrets that you did not know!
...
Breakfasts children from around the world. You have no idea what they are fed ...
 As a light without matches  Collection of funny pictures (97 photos)