Similar to what has been stated by several other people, they are slightly larger than stated in their internal dimensions. I needed this add on for the Levolor Trim + Go blinds I bought from Lowes. The Levolor only includes top mount brackets, but they went in the basement and I didn't have a thick board at the top to hold them. I needed side braces, but Levolor doesn't make that style anymore (which I could find). Based on the reviews I thought I'd give it a try (not much if they don't work after all and maybe I could get them back with Prime). Luckily, they work great with blinds. Nice and tight (but not too tight that I can't take it off if I want to). Just thought I'd post as everyone else seemed concerned about Bali blinds and I didn't see any mention of Lowes' Levolor blinds. Rest assured they worked. At least with the current Levolor that Lowes sells in 2019.
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