1.) should not be used to extract or a hammer, screwdriver instead.2.) do not use screwdriver that oil may really miss phlangkrathaek.3) use screwdriver with a mouth similar to a type of screw head.4) using a screwdriver should catch that butt of wrench, screwdriver, screwdriver grip pens should not be used to screw.Top 5) screwdrivers with insulation in electrical engineer jobs.6. as soon as possible the screwdriver).7) avoid using the screwdriver, screw loosening or removing the old damaged.8.) should be clean and neat.
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