If the drilling hole in the concrete wall towards the drill catches a very durable stone, it is even a great tool with a well-sharpened carbide-tipped is powerless: the drill leads to the side or it quickly “sit.” In this case, the rescue steel construction dowel the proper length to: break the rock and drill further.
Recommend to read
“Sokol-2” — conqueror of Dombay
The best delta glider of amateur construction that took part in the «Dombai Peaks» competition in 1978 was recognized as the «Sokol-2». Its creator was V. D. Mikhailov, a Master of Sport...
A SMALL WINCH IS OF GREAT INTEREST
In the footsteps of virtually every information, published under the heading "ENEA — young innovator", the editor receives many letters. On the envelope address NTTM, young innovators,...
