These twin screw wire clamps are the best, but they're not perfect. The screw on the cap is basically a non-functional decoration: it's conductive, so they can short out in a variety of situations, including plugging in and touching others nearby, as well as almost anything metal. If you get a 90 or 45 degree option, once connected, they can swing to touch and short. And as if that weren't enough, the left/right color coding on each stamp is almost invisible.
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