If you’ve accidentally slipped and hammered your thumb instead of a nail, you know very well that accidents happen quickly (and very painful). If a poorly designed hammer can inflict as much damage, imagine what power tools such as puzzles and nail guns can do.
The tools and useful and necessary, but when used improperly or poorly maintained, can cause personal injury to the user or nearby. Its use requires great care and attention, including preservation and maintenance of their tools, to ensure that a loose handle or the blade stuck not cause serious damage.
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