Torque Master Tools Private Limited supplies Extension Bars or Coupler. Torque Master Tools Private Limited is an ISO 9001:2000 registered organisation. The Extension Bars or Coupler 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 is of same sizse and is available for manual as well as impact application with drive sizes ranging from 1/4 to 2.5 inch square and length from 50mm to 500mm.