| 摘要 |
A sleeve device comprises a sleeve portion, the sleeve portion having a first opening; a first sleeve extending from an upper side of the sleeve portion; the sleeve portion having four sides; two opposite sides of the four sides being suitable for one kind of spanner and the other two opposite sides being suitable for another kind of spanner; a second sleeve; the sleeve portion having four sides; two opposite sides of the four sides being suitable for one kind of spanner and the other two opposite sides being suitable for another kind of spanner; the first sleeve and the second sleeve being formed as a stepped structure; the second sleeve having a second opening. The second sleeve has a shape similar to that of the first sleeve and the size of the second sleeve is smaller than that of the first sleeve.
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