Back up pad itself has a 5/16-24 internal thread
Turn the knob counterclockwise and insert pin on the end of the threaded shaft
1/4" Impact Universal Joint
8mm through 12
Hex head style
14 Piece High Polish SAE Combination Wrench Set KTI41304 UV Master Leak Detection Kit Back up pad itself has14 Piece High Polish SAE Combination Wrench Set Features and Benefits: High polish, smooth finish, heat treated chrome vanadium steel Tools are longer than standard combination wrenches to enable access to hard to reach places Packaged in a kit bag Lifetime warranty Sizes include: 3 8", 7 16", 1 2", 9 16", 5 8", 11 16", 3 4", 13 16", 7 8", 15 16", 1", 1 1 16", 1 1 8" and 1 1 4". WARNING: Cancer and Reproductive Harm www. P65Warnings. ca. gov WARNING: