Through cross screwdriver and screwdriver?
The screwdriver uses the work of the lever when it is used to pry the cover. The power point to the fulcrum distance bigger effort, so more effort than the short long screwdriver screwdriver. The screw driver uses the working principle of the wheel when it screws the screws. When the wheel is greater the more labor-saving, so use the coarse screwdriver than using a screwdriver to tighten the screws to the fine is more labor-saving.
A screwdriver is a rotating screws to force the tools in place to twist, usually with a thin wedge head, the screw head can be inserted into the slot or recess -- Beijing Tianjin Hebei Jinyu and Shaanxi dialect called "screwdriver", Anhui, and Hubei, known as the "driver", the Midwest known as "the knife", the Yangtze River Delta region known as the "screwdriver". The main word (minus) and cross (plus two). There are also commonly used six corner screwdriver, including six corners and six corners outside two.
The difference through cross screwdriver and cross screwdriver is mainly through cross screwdriver with a metal rod passing through, such a solid construction, because the knife and the handle as a whole, through the bar through the rear of the handle, so you can knock with a hammer. The back part of the afterburner, does not damage the screwdriver. The disadvantage is that this tool can be used in electrical equipment operation, even if the switch off is not good, the price is slightly more expensive.
