| 摘要 |
A chuck includes a body having an engaging groove for releasably receiving a bit. A sleeve is slideably mounted around the body. The body further includes an annular groove in an outer periphery thereof. The annular groove includes a positioning portion having an opening extending into the engaging groove. A retainer ring is mounted in the annular groove and includes a section extending into the engaging groove via the opening to engage with and retain the bit in the engaging groove.
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