Drill jig for locating holes to be drilled in a workpiece

A drill jig for locating holes to be drilled in a workpiece, comprising:

• an elongated guiding block having a top face which is formed with a plurality of through-bores for locating holes to be drilled in a workpiece, said through-bores being spaced apart and aligned in a longitudinal direction of said guiding block, a plurality of threaded holes, each of which communicates with a respective one of said through-bores in a direction that is transverse to axes of said through-bores, a bushing and a positioning pin extending removably through two of said through-bores, each of said threaded holes having a locking screw so that said bushing and said positioning pin can be releasably locked in said two through-bores by the corresponding locking screws when they are received in said two through-bores;
• a guiding rod connected to a side face of said guiding block and extending in a direction that is transverse to said longitudinal direction of said guiding block;
• and
• a positioning block having a bottom face, an abutting plate depending from said bottom face of said positioning block, a top face which is formed with a threaded bore, a through hole through which said guiding rod slidably passes, said through hole communicating with said threaded bore in a direction that is transverse to an axis of said threaded bore, a locking bolt being threaded into said threaded bore so that said positioning block can be locked releasably to said guiding rod.