Short answer is: Not sure. We haven't viewed 4K content through it yet.
Longer answer is: Probably. Through my research, I've found that there are really not many differences between "regular HDMI" and "4K HDMI" cables. When 4K was released, it became an opportunity for companies to market "New! Improved! Faster! 4K HDMI Cables for all your 4K ULTRA HIGH DEF Home Entertainment Needs," and people have bought into it. Most HDMI cables can handle 4K content, even when you throw in the extra data for High Dynamic Range (HDR) media (if your content and components use HDR). My advice would be to try to order it, hook it up without mounting everything, and if it works fine, finish your install. If not, return it. I've got 2 of these. One behind my TV and one in my AV cabinet. It makes for a super clean and professional look, and I couldn't be happier with the connection for regular HD content. Again, I'm sure it'll handle 4K just fine. If ever make the jump to 10K when that becomes the industry standard, we'll see...but for now, I'm sure I'll be good for quite a few years with this plate.
But... The RCA's are a little different that the ones in the keystone modules. And the Decora plate is a bit different than the residential electrical variety. the cover plate screws were some oddball sheetmetal screws instead of the standard 6-32 machine screw. I threw the screws away.
At least the hex holes are consistent with Monoprice speaker jacks. I swapped in some bananas.
Handy for HDMI and use either composite or component jacks. [Installation - connection] was easy except for the box size. Since HDMI or RCA cables will likely be stiff at the ends, when they attach to the inside of the jack, a deep box or open back box is needed. Quality of video and audio are good.
I needed a wall plate for A/V for my house. I have a projector with a ceiling mount and I needed analog A/V (for compatability with an old original X-Box system) and composite (for menu/setup on my AV/R) and HDMI (for HD sources). This did the trick, perfectly!
i bought two of these for an in-wall wiring of the three connections of this plate. everything about this plate model is nice, easy hookups, no wire splicing, just plug your in-wall wire to the connectors and mount to the in-wall box. the only problem i had was the hdmi connection was very very loose and would barely stay in place with hardly any pull of the wire at all. i had to put a tiny zip tie around the thin part of the hdmi wire (past the rubber that makes the head/plug portion), then put a second, larger ziptie through the first one, and then wrap around the frame of the wall plate. this is holding the in-wall hdmi cable in place securely and then i zip tied all the cables together about 1 foot away from the plate so that they all will be held in place. other than that, nice product.
PROS: composite and component hookups are nice and snug. they do a good job of holding onto the in-wall connection.
CONS: hdmi connection very loose for the in-wall side of the connection.
Two issues, first is that the HDMI jack would not hold the cable well enough. It would just fall out as I tried to install it. This was ok since I really bought it for the 6 RCA connectors. I have two other HDMI's installed next to it. However, I was using a recessed gang box and there simply wasn't enough wall cavity left with the recessed box to fit the RCA cables. So now I need to "un-recess" this part of the box. Not really the product's issue, just don't expect good results with a recessed box.