How to get select at a depth?

Hello, I create a model with deep creases but didn’t preplan to apply a material there but now I want to.
Here is a picture:


How do I select after a depth like x-4m?

Go to orthographic side view, turn X-ray on with Alt Z, press B for box select, drag over the needed depth from top to bottom. Voila! :slight_smile:

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