| 摘要 |
<p>The device has a support frame with a set of perforations (c) for guidance of a circle drill, and a set of holes (a, b) for receiving fixing screws, where the support frame is provided with a spirit level (d). The spirit level is rotatably supported, where the perforations are separated from each other at a distance of about 71 mm in the support frame. The support frame has markings (e) at the perforations in the symmetry lines of the perforations. An independent claim is also included for a method for guidance of a circular drill for installation of a hollow wall box.</p> |
