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
MAIN BATTLE TANK “ABRAMS”
Large-scale work on designing a new main battle tank began in the USA after the termination in 1970 of the joint with Germany development of a promising tank МВТ70. In February 1972, the...
THE INDICATOR OF INCLUSION OF HEADLIGHTS
Under the new rules of the road in the sake of safety, drivers of vehicles (especially when driving outside the city) should include the day of the lights But turn them off after a stop...
