text: These registers are a great idea, and nicely made. Unfortunately with a slab on grade and engineered hardwood installation, they were not flush. They are made to work with a subfloor that can be cut to accommodate. By the time we realized they weren’t going to work for us, the return window was expired by one day! My bad for being organized and ordering ahead of time! If you have regular hardwood and OSB subfloor, I would recommend. Otherwise, think twice!