The elastic retaining ring is also called a circlip. The circlip is a special tool used to install the inner circlip and the outer circlip. It belongs to the needle-nose pliers in appearance. The pliers can be straight inside, straight outside, curved inside, or outside There are several forms of bending, which can not only be used to install the circlip, but also can be used to remove the circlip. The circlip pliers are divided into two categories: the outer circlip pliers and the inner circlip pliers, which are used to disassemble and assemble the external circlip of the shaft and the circlip used in the hole. Retaining ring pliers, commonly known as circlip pliers, are used to disassemble and assemble elastic retaining rings. Since the retaining ring open type is divided into two types: hole use and shaft use and different installation positions, the retaining ring pliers can be divided into straight mouth type and curved mouth type, and can be divided into hole and shaft retaining ring pliers. Among them, the outer circlip The pliers are also called shaft circlip pliers, and the inner circlip pliers are also called hole circlip pliers.