Simple inclined-hole drilling jig

An improved simple inclined-hole drilling jig, comprising a jig body with a long shaft extension having a crossover plane able to press evenly against the wood workpiece at its bottom and a beveled end member disposed at the front end of long shaft;

• the beveled end member being at least concavely configured with a guiding shaft hole, which extends downwardly from the beveled end member through the crossover plane;
• the upper end of guiding shaft hole being pivotally configured with a guide bushing for drill bit to pass through;
• the rear end and side surfaces of jig body being respectively formed with a reference face and two sidewalls perpendicular to the crossover plane;
• characterized in which the sidewall is at least concavely disposed with a dust guide groove intercrossing the guiding shaft hole, and is pivotally disposed with a graduated extension board in a manner that allows axial displacement and positioning;
• the end of the extension board is bent to form a retaining end plane parallel to the reference face to replace the reference face of jig body and extendingly adjust the axle spread of reference face, thereby greatly enhancing the operating performance of the simple drilling jig.