Updated rating (now 5 stars): I decided to keep these wrenches after ordering and trying the plastic version from another supplier which turned out to be entirely proprietary. iGreely made much better! I have found that this tool works with the MC4 connectors on my panels and the standard wrench works with the screw fittings on my incompatible MC4 connectors. I also found problematic MC4s not only problematic with this tool; In fact they don't connect properly to the MC4 connector on my panels and I will be returning them. First Review: Quality construction, but none of the jaws fit the cable entry screw on my MC-4 connectors. Too bad because it looks like I'll have to use the plastic version of the tool. FYI, the wide end of the wrench, including the nose cutouts, is 11/16".
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