The so-called hand tools, also known as hand tools, are relative to electric tools. Mainly by means of hand to twist or apply force to the tool. Hand tools can be divided into wrenches, pliers, screwdrivers, tape measures, hammers, sockets, cuttings, scissors, sets, and auxiliary tools such as tool carts, etc., each category is different 's model. The spanners include open-end wrenches (rigid hands), double-pliers, dual-purpose wrenches (composite wrenches), tubing wrenches, T-socket wrenches, cross-socket wrenches, adjustable wrenches and other categories; pliers include wire pliers, needle-nose pliers, oblique Nose pliers, retaining ring pliers, carp pliers, water pump pliers, pipe pliers, strong pliers and other categories; screwdrivers have a character, cross, rice character, hexagon, pattern and other categories; cutting categories include files, diamond files, iron scissors, aviation scissors , utility knife, square pipe saw, pipe cutter, bolt cutter and other categories; in terms of material, it is very important to choose suitable hand tools, such as Luo vanadium steel, carbon steel, alloy steel, etc. The factors to consider include: process needs, The nature of the work, the material of the tool, the shape, size and weight of the tool itself.