Excellent connector for wires of multiple size - and - reusable.  Note however:  This is the first time I bought-used these; and I was surprised the amount of force it took to lift the lever all the way up.  At first I thought they weren't working - or that I bought the wrong size.  The lever didn't seem to open - and only lifted up about 15 degrees; and when I pushed a wire into the bottom segment of the hole insert - it didn't catch or stay.  You need to push the lever up hard.  I thought I was going to break it.  and then - Yes - the lever opens up a full 90 degrees.  Then the wire inserts into the hole and on the top of the internal insert mechanism (not at the bottom as I thought initially).  When you close the lever - it is a very tight hold on the wire indeed.