Set of 3 couplers
- Allows use of square drivers smaller than socket drive sizes: - 1/4" square drive + D.169RJ --> 3/8" socket (ø 1/4` : 28,7 - R 1/4` : 13 mm). - 3/8" square drive + D.169JS --> 1/2" socket (ø 3/8` : 37,8 - R 3,8` : 16 mm). - 1/2" square drive --> 3/4" socket (ø 1/4` : 43,9 - R 1/8` : 22).
- Knurl allows hand tightening where access is difficult.
