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"These are inside the walls, and finding them can be difficult. Studs are vertical boards -- they are generally 2 x 4's, although they actually measure 1 1/2 inches thick and 3 1/2 wide -- and are installed at intervals inside a wall to strengthen it and support the wallboard, paneling or plaster."
<https://forum.civiljungle.com/how-big-are-studs-in-walls/>