These should be attached to the existing Blum hinges. As mentioned, this should depend on the version of blum loops you have. Mine have the requisite square hole and are about 12 years old, but these blocks didn't pop out right away. They won't slide right away, they won't catch the hole. I researched online and others had the same problem. Some people have managed to adjust (bend) the handle a bit and squeeze it straight. It took me a few tries to get the bend right, but I was able to install it. Once installed they work fine. I give them 3 stars because they are not easy to install.
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