A fitting arrangement for mounting a handle to a door, the door having a predetermined thickness and an interior lock chamber. A rod interconnects two handles extending through the lock chamber. A washer or cover plate is connected to an adjustment device for adaptation of the position of the washer or cover plate to the predetermined thickness. The fitting arrangement includes an adjustment device having a coupling with a magnet for fixing of the adjustment device on the lock chamber. The adjustment device has an outer part intended for securing on the washer or cover plate and an inner part with the magnet, the outer and the inner parts being adjustably connected to one another by the intermediary of a thread union.