| 摘要 |
<p>The invention provides a tool (1) configured for engagement with a polygonal object (2) requiring to be rotated about a rotational axis. The tool includes one or more supports for supporting contact faces (3) which engage with said polygonal object and two or more contact face portions having engagement surfaces in the form of contact faces for engaging complementary surfaces of the polygonal object, said contact faces being displaceably located for displacement relative to the supports and the object.</p> |
