| 摘要 |
<p>A flat strip of metal or wood is provided with two linear elevations positioned at a distance from each other at both sides of a slot. A multitude of cubes (2, 2, 2, 2), each with two crosswise arranged bores (5, 5, 5, 5) can be slid along or secured to the rail (3) as required. The bores (5, 5, 5, 5) are of different diameters, matching a scale (6, 7) located at the strip (3) and facilitating a precise guiding of the drill tool.</p> |
