I bought 3 5/8" - 5 1/4" to run HDMI and USB cables in my recording studio. Not in the cabin itself, but in the room where the cabin is placed. There was an old "wire under the door carpet" until I replaced the carpet. I couldn't bring myself to put on a new carpet and I didn't want the cables to get pinched by the door when it was closed, so I got one of those instead. Installation was pretty easy. I used a long bit with an extension for the pilot holes so the middle bit had room to go through and fit together on either side. It is recommended that a second person hold a page and I did that and it worked like a charm. Try not to overtighten as it's plastic and can tear, so just have the other person hold the end of it while you get the job done. One person can install alone if you use masking tape to hold the other end. It looks like a 3D printer was used but the one I got seemed really solid and the ends were smooth and nice. Nice solid pieces and installed in about 10 minutes and took longer to set up and clean than installation. Overall I'm very happy with it and will definitely be buying more.
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