These are great, should have gotten them long time ago. My 16' extension ladder is a type 3 (200lb rating), so the side rails of the ladder which the levelers attach to are a bit narrower than most ladders, and that made it a little more challenging to attach the levelers to. But I got them on and they work beautifully (well, as beautiful as a ladder leveler can get, anyway - lol). They're sturdy and solid. I've actually used them more often on level ground to extend my ladder to the max equally on both legs to reach those tough high areas. They work very well over stairs provided the stair treads are wide enough. Ironically, adding the levelers to the ladder also increased the overall width of the ladder causing the ladder to be just a tad too wide to fit over narrow stairs. (Not all stairs are the same width! Whoda thunk it?) Out of the 3 houses that I've painted tall walls by the stairs, two of them had stairs wide enough for the ladder to safely fit on, and one did not. So I guess if you really want to have all your bases covered, you need to buy one of those Pivit levelers, too. But I really do like these Universal Level-Ett ladder levelers. Works great over most stairs (provided they're wide enough), and they've turned my 16' ladder into a 17' ladder, and that is very valuable to me when I'm painting those tall 2-story walls. I'm only 5'-3". and I need every extra inch I can get!