| 摘要 |
Disc shaped device (1,2) to be placed on an electrical contact box which requires to be mounted on a base with covering material such as laminate, wood panelling etc. This device facilitates making a hole in the laminate etc. for the electrical box, with the aid of its central magnetic plug (3), and by allowing marking of the centre of the electrical box's rear side easily with compasses from the outside, in order to protect electric cables from damage and to prevent impurities entering the electrical box in the form of bore shavings or sawdust.<IMAGE> |
