Extremely limited utility. They are only suitable for middle panels where you already have a panel and connect the panels edge to edge. It does not help if you place the first panel or panels without an edge in front of another panel. I had to cover three rooms with ceilings and half a house with walls myself. I found a 2x4 and a few deck screws to create an edge to be safer and easier to use than these. only used it for 8 headers and footers. One day the plastic broke and the record fell on my head and then onto the floor. From that point on I finished the house with my 2x4 and honestly it was less of a disappointment. Seriously, just use 2x4 scrap and some patio screws and save yourself some money. I like to encourage ideas for new tools, but this is poorly implemented. If it was aluminum they would be MUCH more useful.
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