| 摘要 |
A device (10) for use in combination with a hole saw (12) of the type including a cylindrical hollow body (14) having a circular lower cutting edge (16), a top mandrel (18) with a shank (20) in engagement with a chuck (22) of a drill (24) and a pilot bit (26) for guiding the hole saw (12) when cutting a new opening in a workpiece (28) having a predrilled opening (30), in which the center of the new opening lies within the predrilled opening (30). The device (10) comprises a dowel plug (32) having a plurality of holes (34) therethrough. The dowel plug (32) is inserted into the predrilled opening (30), so that the pilot bit (26) of the hole saw (12) can be positioned in a rotatable manner into one of the holes (34) in the dowel plug (32) on center or off center with the predrilled opening (30) in the workpiece (28).
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