| 摘要 |
A disposable drill bit guide for optically guiding a drill bit in a manner normal to a workpiece, and having, a sheet of relatively thin disposable material said sheet having a reflective surface for providing a reflective image of a drill bit, adhesive means on said sheet for adhesively fastening same on a workpiece with said reflective surface exposed to view, and visible guide lines on said sheet, said guide lines intersecting one another at right angles, whereby a drill bit may be centered on such intersection and its image viewed in said reflective surface, and checked with reference to said guide lines.
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