I bought 2 of these lamps to install over my kitchen sink during our remodel. Some reviews said they werent strong enough to hold the shade and would slip down so I unboxed them and put them together to see if they would hold and they did! They are beautiful and I cant wait to get them put in! 
UPDATE Apparently when I put these together prior to installing them to check them out I didn’t hold them up long enough to see if they stayed in position. We installed these lights and after 10 minutes they started sliding down. They will NOT stay adjusted. They slide down every time. The set screw isn’t long enough and the arms aren’t strong enough to hold up the heavy glass shade. We tried everything to fix this and I’m so upset to have to take these down and buy something else. Very disappointing considering the cost. I expected better.