They are great for use with a standard 2 x 4 to latch a door from the inside. Way better than any bar you could find. I have a 10ft opening with 2.5ft doors. I used 4 of these side by side in a row at the top and 4 in a row at the bottom with 2 standard 8ft 2 x 4's to keep the doors closed and aligned so they don't warp. I gave them 4* because I felt the 3 hole attachment area should have been longer as the surface area isn't that large compared to the 2 x 4 arm you insert into.
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