This combination is consistent with the essence of modernization, which want to offer such a famous fixture as a screw. It is clear to everyone that it holds better than a nail, but it requires more effort and time for screwing. If it is to drive with a hammer, the material is crushed, it does not form a threaded groove. My screw (1) with longitudinal grooves on the threaded part, produced by forcing through a die (2). It is possible to drive a nail. You only need a little then turn the bolt with a screwdriver: the remaining part of the coils will cut into the material and will hold securely.
C. CUTTINGS, Leningrad
Recommend to read
AMPHIBIAN XXI CENTURY
In late September 1998 in Irkutsk, an event occurred that had no publicity, but, nevertheless, its significance is far beyond the scope of this Siberian city. From the airfield of the...
PEN WITH A BALL?
No, those haven't been invented yet. But what is offered the option of upgrading their outdated writing site. Previously the old marker must be disassembled to remove the back of the...
