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Screwdriver is a tool used to twist in screws to force them into position. It usually has a thin wedge-shaped head that can be inserted into the slot or recess of the screw head - also known as a "wrench." There are mainly two types: flathead (negative) and crosshead (positive). Commonly seen are also hexagonal screwdrivers, including internal hexagonal and external hexagonal. Screwdrivers are further classified into traditional screwdrivers (English: Screwdriver) and ratchet screwdrivers (electric screwdrivers) (English: Ratchet screwdriver). Traditional screwdrivers are composed of a plastic handle and a iron bar that can lock the screw, while ratchet screwdrivers are composed of a plastic handle and a ratchet mechanism. The latter allows the iron bar to spin clockwise or counterclockwise, utilizing the spinning mechanism to enhance the efficiency of locking the screw without having to rotate the power driver (hand) back to its original position. Usage: Aim the specialized end of the screwdriver at the top recess of the screw, fix it, and then start rotating the handle. According to the standard specification, "Presented by the closed decree to compare the cricket 1278799200128338 supervision empty and empty, the closed decree to compare the cricket 127879127876 leech 128342 sand. A word screwdriver can be applied to the cross screw. However, the cross screw has a stronger ability to resist deformation. Matters 1: When using, do not use the screwdriver as a pry bar or chisel. 2: Before use, it should be cleaned of oil and grease from the screwdriver handle and the mouth end to prevent slip and accidents during work, and after use, it should also be cleaned. 3: The correct method is to hold the screwdriver with the right hand, the hand swollen "127804 to play, so as to avoid the risk of injury. 4: When starting to loosen or finally tighten, apply pressure to the screwdriver with your hand and then twist the screwdriver with your wrist force; when the bolt is loose, you can lightly press the screwdriver handle with your palm, and quickly rotate the screwdriver with your thumb, middle finger and index finger. 5: The mouth end of the screwdriver should be matched with the groove on the bolt or screw. If the mouth end is too thin, it is easy to break, too thick, it cannot be completely embedded in the groove, which may damage the blade or the groove of the bolt. 6: Screwdrivers are hand tools used to tighten or loosen bolts or screws with slots. There are several types of screwdrivers, including flathead screwdrivers, crosshead screwdrivers, offset screwdrivers, etc.