In every apartment or house, even where there is no home workshop, we should have three sets of different drills and an electric drill, preferably with a stroke. One set of concrete drill bits should contain a drill bit with a diameter 4, 6, 8 i 10 mm. The set of metal drill bits should include drill bits with a diameter from 1 do 10 mm with gradation every 0,5 mm. A set of feather drill bits for wood is the best, when it will have diameters 6, 8, 10, 12, 16, 18 i 20 mm. We will also be able to drill in wood with metal drills.

