US Patent 8376333 Mechanical jig

A jig for drilling intersecting holes in a work piece. The jig comprises a base for supporting the work piece and a first template operatively coupled to the base and having a bolt-hole guide located along a first axis of the template, the bolt-hole guide having a diameter sized to receive a first drill bit. The jig also includes a second template operatively coupled to the base and having a barrel-nut hole guide located along a second axis of the template, perpendicular and intersecting the first axis. The barrel-nut hole guide has a diameter larger than the diameter of the bolt-hole guide and is sized to receive a second drill bit.