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Sparks, smoke, crunch and burning smell: what can break in a drill or screwdriver
We understand why drills and screwdrivers smoke, spew sparks, overheat, make strange sounds and work poorly

Noise levels of tools and construction equipment
The concepts of sound power and sound pressure, as well as the differences between them in fact

Drill chuck: types and differences
Specifics of different types of chucks for drilling and working with fasteners

Screwdriver that can drill concrete: myth or reality
What does it take to drill a hole in the wall with a screwdriver? Which model should I choose for drilling concrete?