I installed bookshelves in my living room that I wanted to turn into an entertainment system. They are perfect for running cables to adjacent shelves and look fantastic. I had no problem keeping the two pieces together and they actually fit quite well. The 2-1/2" opening is large enough for power cords, speaker wire, and A/V cables. I used a small hacksaw to cut them out and it was a chore (and given the smell, I probably have those too toxic fumes inhaled).If I were to order more I'd probably use a dremel to get them done quickly. Cut everything, the two pieces slipped right in, literally a perfect fit. If you're fitting cables, hoses or even pipes with a nice Finish I cannot recommend it highly enough.
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