This is how the doors in the houses look like.

I’d assumed both the door and the frame are made of wood. I’m trying to install a pull-up bar like this one below, where both ends are anchored into the door frame.

In my old house where the frame is made of wood, what I did was to drill small holes into the door frame with wood drill before screwing bigger wood tapping screws into those holes to secure the anchors. Both the screws and the drill enter into the frame like a hot knife on butter.
But in my new Matrix house, both the screw and the drill just cannot go in. It feels a little like plastic when I knock on it. It also sounds hollow at some areas and solid at others.
Does anyone know what material the frame is, and how can I secure the screws in?
Jun 8 2021, 10:20 PM, updated 5y ago
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