Hand pliers are commonly used hand tools to grip parts, cut metal wires, cut metal sheets, or bend metal sheets or wires into the desired shape. The specification of pliers refers to the length of the pliers body (mm). According to their usage, they can be divided into wire pliers, pointed nose pliers, flat nose pliers, round nose pliers, curved nose pliers, etc.
（1） Steel wire pliers
Wire pliers are used to clamp or bend thin, cylindrical metal parts or wires. The wire pliers with a cutting edge next to them can also be used to cut fine metal (insulated plastic sleeves can be used to cut wires), and are the most widely used manual tools. The structure is shown in Figure 1-1.
Steel wire pliers can be divided into two types according to the handle: without plastic sleeve and with plastic sleeve; According to the form of jaws, they can be divided into three types: flat jaws, concave jaws, and shear jaws. Its specifications are shown in Table 1-1.
（2） Pointed nose pliers
Sharp nose pliers are suitable for clamping small parts in narrow workspace positions, mainly used for installation and maintenance work in instruments, telecommunications, and electrical industries. Sharp nose pliers with cutting edges can also cut fine metal wires. The structure is shown in Figure 6-2.
Sharp nose pliers can be divided into two types based on the handle: without plastic cover and with plastic cover. Iron handle pointed nose pliers are prohibited for electricians, and the withstand voltage strength of the insulated handle is 500V. There are five commonly used specifications: 125, 140, 160, 180, and 200mm.
The tip of the pointed nose pliers is thin and has undergone heat treatment. The clamped object should not be too large and the force should not be too strong to prevent damage to the pliers. When using, do not use a sharp nose to pry the workpiece to avoid deformation caused by the pliers.
（3） Flat nose pliers
Flat nose pliers are suitable for installing and removing small parts such as pins and springs in narrow or concave working spaces, as well as for bending metal sheets or fine wires. The structure is shown in Figures 1-3.
Flat nose pliers can be divided into two types based on the pliers head: short nose and long nose. Its specifications are shown in Table 1-2.
（4） Round nose pliers
Round nose pliers can bend metal sheets or fine wires into a circle and are commonly used tools in the assembly and maintenance industries of instruments, telecommunications equipment, and household appliances. The structure is shown in Figures 1-4.
Round nose pliers can be divided into two types based on the handle: those with plastic sleeves and those without plastic sleeves. Iron handle round nose pliers are prohibited for electricians, and the withstand voltage strength of the insulated handle is 500V. There are five commonly used specifications: 125, 140, 160, 180, and 200mm.
（5） Curved nose pliers
Curved nose pliers are similar to flat nose pliers and are mainly used to grip parts in narrow or concave working spaces. The structure is shown in Figures 6-5.
Curved nose pliers can be divided into two types based on the handle: those with plastic sleeves and those without plastic sleeves. Iron handle curved nose pliers are prohibited for electricians, and the withstand voltage strength of the insulated handle is 500V. There are four commonly used specifications: 140, 160, 180, and 200mm.
（6） Oblique nose pliers
Diagonal pliers are commonly used tools for cutting metal wires. Flat mouthed diagonal pliers can also cut metal wires in grooves. Commonly used in power and wire installation workplaces. The structure is shown in Figures 1-6.
Diagonal nose pliers can be divided into two types based on the handle: with plastic cover and without plastic cover. Iron handle diagonal nose pliers are prohibited for electricians, and the withstand voltage strength of the insulated handle is 500V. Its specifications are shown in Table 6-3.
（7） Retaining ring pliers
The retaining ring pliers are specifically designed for disassembling spring retaining rings. The retaining ring pliers are divided into two types: shaft type and hole type, which can adapt to the disassembly and assembly of retaining rings in various positions. The structure is shown in Figures 1-7.
The retaining ring pliers can be divided into two types of structures based on the shape of the jaws: straight mouth type and curved mouth type (the curved mouth structure is generally 90 °, but there are also products with 45 °), commonly used in two sizes of 150 and 175mm. When using retaining ring pliers, prevent the retaining ring from popping out and injuring people.
（8） Carp pliers
Carp pliers are used to clamp flat or cylindrical metal parts. The opening width of the pliers has two adjustable positions, allowing it to clamp thicker or larger parts. The blade can cut metal wires and can also replace a wrench for disassembling bolts, nuts, etc. The structure is shown in Figures 1-8. There are five commonly used specifications: 125, 150, 165, 200, and 250mm.
（9） Walnut pliers
Walnut pliers can be used to cut nails or other metal wires, pull out nails or metal wires that are nailed into wood or other non-metallic materials, mainly used for pulling out nails from wood or shoes. The structure is shown in Figures 1-9.
Walnut pliers can be divided into two types: round shoulder (Type A) and square shoulder (Type B). There are six commonly used specifications: 125, 150, 175, 225, 250, and 260mm.
（10） Top cutting pliers
Top cutting pliers are commonly used in mechanical and electrical assembly and maintenance work, to cut metal wires. The structure is shown in Figures 1-10.
Top cutting pliers come in six sizes: 100, 125, 140, 160, 180, and 200 mm.
（11） Strong pliers
Strong pliers can grip pipes, pipes, and other parts. It can also clamp parts for riveting, welding, grinding and other processing, and can also be used as a wrench. Due to the self-locking of the jaws after clamping, which will not naturally fall off, the clamping force is large, and the jaws have advantages such as multiple adjustable positions, making it a multifunctional and convenient tool to use. The structure is shown in Figures 1-11.
The specifications of the pliers refer to the length of the pliers body × The maximum opening of the jaws (mm). Commonly used as 220 × 50 (mm)
