What is the retaining ring like

The snap ring is introduced as follows:
The snap ring, also known as the retaining ring or retaining ring, belongs to a kind of fastener. It is installed in the shaft groove or hole groove of machines and equipment, and plays the role of preventing the parts on the shaft or hole from moving left and right
STW and RTW are commonly used. 65Mn spring steel is mainly used in mainland China
The corresponding standard of snap ring is the national standard, while the domestic one with better quality belongs to the one produced in Zhejiang Province. The snap spring produced in Zhejiang Province of China is mainly based on the Japanese standard, and the material is sk7 spring steel
Of course, there are also C-type, E-type and U-type snap rings