Top critical review
Reviewed in the United States on November 13, 2019
The plug has several poorly designed features. First, the National Electrical Code (NEC) requires that outlets be wired with 12 gauge wire. The back of these plugs have a hole to insert the stripped wire into and lock the wire in place. Unfortunately, the hole will not fit a 12 gauge wire, only a 14 gauge wire. So it is useless.
Second, I normally attach the line in to one set of screws, and the line out to the other set of screws. Unfortunately it is not possible to put a loop around one screw on each side because the plastic prevents the wire from fitting under the screw. The only way to safely wire the plug is to use a short piece of wire looped around the one screw that will accept it, and then a wire nut to connect the short piece of wire to the black or white feed wire.
There are much better plugs that will either let you insert 12 gauge wire into the locking hole, or use both screws on the side of the plug for about the same price.