I bought these for an exterior door I was building for my barn. My rail is 1/8" x 1.25" steel and they fit great. The hex head screws dug into the rail and locked the stopper in place. Spring is difficult. The paintwork (or any other finish) is quite harsh to the touch. Not sure how well the exposed steel parts hold up to outdoor use but time will tell, at this price point and how easy they are to put on and take off even though I'm only 2 years out of the kit before then. Rust is starting, I'd say it's still pretty good.
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