Manual wrench is also called ordinary wrench. It is mainly used in ordinary life and work. Its use is relatively simple. It is mainly divided into single-ended wrench, double-ended wrench, adjustable wrench, plum wrench, multi-purpose wrench, percussion wrench, and socket wrench. , socket screwdriver, torque wrench, torque wrench, cross wrench, ratchet wrench, hook wrench, allen wrench, internal square wrench, manual clutch torque wrench, pipe wrench, T-type wrench, L-type wrench, trident wrench, crescent Wrench, oil drum wrench, tire wrench, spark plug wrench, filter wrench, combination wrench, other wrenches, etc. Torque wrenches are divided into signal wrenches, pointer wrenches and digital display wrenches. [1] Uses and technical characteristics of open-end wrenchesScrews are the main fasteners in mechanical equipment. Open-end wrenches are important tools for processing, production and maintenance in the machinery industry. This project is a revolution of traditional wrench tools. It has the following advantages. 1. Works fast, working three to four times faster than traditional wrenches and faster than a quick wrench. 2. An open-end wrench can be used for 2-6 kinds of screws, while a double-ended wrench can only be used for 2 kinds of screws. An open-end wrench is equivalent to 2-3 fixed wrenches, equivalent to an adjustable wrench but can work quickly without adjusting the opening. 3. It has a long service life and cannot be broken, and the front quick wrench is easy to break. 4. The manufacturing process is simple, and its cost is lower than that of a dumb wrench. 5. Light weight, easy to carry, labor-saving work. [1] 1. Bright chrome: as bright as a mirror; 2. Chromium: matt; 2. 3. Electrophoresis: black, with brightness, under the action of external direct current, the charged particles move directionally to the cathode or anode in the dispersed medium force to promote the separation of substances; 3. Phosphating: black, but with a dark luster, the substance is immersed in the phosphating solution, and a layer of water-insoluble crystalline phosphorus is deposited on the instant surface, which is the process of hydrochloric acid conversion. 5. Grey Nickel: It is a brand-new surface treatment method with strong anti-rust ability and will increase the service life of the product. 6. Other treatments include blackening, nickel-iron alloy, pearl nickel, black nickel and titanium plating