The frame I put it on has one Measuring 2" in diameter, and 50mm isn't even close. It measured from 48.88mm to 49.3mm depending on where you measured around the hole. I'm lucky enough to have the equipment to order to solve this problem. However, if you don't have a drill and sandpaper on a 1/2" wood dowel, this will do for you. I gave it three stars because I was able to fix the problem and it looks good.