| 摘要 |
An elongated base structure is provided defining generally right angularly disposed elongated abutment surfaces extending parallelly along a predetermined path disposed in the included angle defined between the abutment surfaces. Abutment structure is carried by one end of the base structure and defines journal structure whose center axis coincides with the aforementioned path. The journal structure is provided for journalling and slidably receiving the shank end of an elongated wood boring drill member therethrough. Further, the base structure includes a clamp portion supported therefrom and opposing and adjustably shiftable toward and away from one of the aforementioned abutment surfaces. Further, an elongated wood boring drill member including a wood boring end and a supportive shank end is provided and the shank end is journalled and slidably received through the journal structure and provided with an abutment on the shank end thereof adjustably shiftably positionable therealong for abutting engagement with the abutment structure remote from the end of the base structure from which the clamp portion is supported.
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