Who suffered, making holes in concrete slab, knows that the best assistant in this case — a power drill. Well, if it does not exist? You will rescue two hammer and carbide drill bit d 4 and 7 mm. First, work a smaller drill bit and lightly hitting it with a hammer and turning a bit after each stroke. Breaking to a depth of 5-10 mm, model drill more and clean the resulting hole. The cycle is then repeated in 20 minutes manages to punch a hole to a depth of 40 mm.
Recommend to read
THE MACHINE — TV
The image on the blue screen was perceived undistorted, the viewer must be directly in front of him, not the side. Not by chance we no-no and will deploy this difficult box, if the...
THE CEILING OF LEAVES
Is it possible to make sound insulation of the ceiling? For this purpose, will serve a suspended acoustical ceiling. It performs several functions, it reduces the energy of the reflected...
