A coupler that helps the operator to reach nut/bolts located at inaccessible places or where a driving tool cannot have access to sockets and /or where clearance for operation of driving tool is not available. One end of the Extension Bar is male which fits into the square drive of the sockets and the other end is a female square drive where the driving tool fits in. The male and female square drive of this tool are of same size and are available for manual as well as impact application with drive sizes ranging from ¼" to 2 ½" square & length from 50 mm to 500 mm.