| 摘要 |
The key (1) has two straight arms (4,5) of the same cross-section and each has a polygonal driving portion (16,17) at the free end. A passage (22) through the sleeve is of cross-section matching that of the arms, so that it can be fitted to either, being secured in place by a detachable locking device (25).The sleeve can be shorter than the longer arm, which can be integral with the shorter one. The arms can be of round or hexagonal cross-section, and the length of the longer one can be a multiple of that of the shorter one.
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