| 摘要 |
A retainer ring includes at least two holding sections and at least one engaging section. Each holding section has a radius of curvature equal to half of a diameter of a reduced section of a first object, e.g., an adaptor. The engaging section has a radius of curvature greater than that of the holding sections. The holding sections securely clamp the reduced section of the first object with the engaging section partially protruding out of the reduced section of the first object for engaging with a second object e.g., a box end of a wrench.
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