Abstract: A relatively rigid polymeric retaining device is provided for attachment to a pre-hung door assembly. The device includes a planar surface for placement against the door face and includes a cylindrical insert for placement within the hardware bore or opening. A stabilizer is attached perpendicularly to the device for assisting in spacing and holding the door in a fixed position relative to the frame. The retaining device is attached by small staples or the like and once the door is installed in a wall the device can easily be removed without damage to the door or frame.