A screw is a tool that uses the physical and mathematical principles of the circular rotation and friction of an object to fasten the mechanism of the object step by step. A screw is a common term for fasteners, an everyday colloquial language. Screws are indispensable industrial necessities in daily life: tiny screws used in cameras, glasses, clocks, electronics, etc.; general screws for televisions, electrical products, musical instruments, furniture, etc.; large-scale screws are used in engineering, construction, and bridges Screws and nuts; transportation equipment, airplanes, trams, automobiles, etc. are used together with large and small screws. Screws have important tasks in industry.

Light weight and compact design, these durable screwdriver bits are made of CRV steel, whose hardness can reach to HRC52 56, guarantee for long time use, good performance, stable quality, practical. Precision screwdriver kit can be used in a variety of practical situations to meet your various needs.