I needed one of these as a spare part for a wall lamp with a lampshade. You couldn't find them at Home Depot, so we went to Revain. They arrived quickly and undamaged, but the problem is that there are only two notches on the inside, so you can only screw the thing in a few turns, which means that in my case the lampshade is still completely loose and wobbly. . I needed it to go up another inch to work, so just make sure you check your specific needs for that. I have no idea how to find one with a full spiral inside for it to work properly. None of the specs seem to make it clear. So frustrating. I'm giving it 3 stars because I think it works great for something, but not at all for this seemingly simple task.
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