The invention concerns a fixture, for example a sun visor used in a vehicle, comprising a covering element provided with a latch member and a basic body rotatably carried on a spindle element. The spindle element includes a positioning member. When the covering element and basic body are counter-rotated on the spindle element, the positioning member moves the latch member from a mounting position to a fitted position. The fixture when installed can be locked by means of the latch member on a fitted body which, for example, may be an interior trim piece of the vehicle.