Set of 3 couplers
• Allows use of square drivers smaller than socket drive sizes:
- 1/4" square drive + D.169RJ --> 3/8" socket.
- 3/8" square drive + D.169JS --> 1/2" socket.
- 1/2" square drive --> 3/4" socket.
• Compactness means that fewer tools are needed for in situ