How do you unscrew the screw without the screwdriver and the opener?
Screw for daily life indispensable necessities such as: industrial cameras, watches, glasses, small electronics use screws; screws general TV, electrical products, instruments, furniture etc.; as for engineering, construction, bridges using large screws and nuts; transportation equipment, aircraft, automobile, tram is the size of screw and. Screws have an important task in industry. As long as there is industry on earth, the function of a screw is always important. Screw is a common invention in the production and life of people for thousands of years. According to the application field, it is the first invention of human being.
A screw is a tool for fastening the parts of a machine step by step by using the physics and mathematical principles of the object's bevel, round, rotary, and frictional forces. A screw is a general term for fasteners.
A thin sheet of metal can be used, such as a knife, a small clip, etc., provided that the screws are crossed or one word. Some unique screws must use special tools.
