The present embodiments provide for a system of fastening devices, e.g., mounts, brackets, and assemblies for installing roller window shades. In one embodiment, the fastening device system comprises two one-piece, disk-shaped mounting brackets, one for each end of a shade tube, wherein the mounting brackets are configured such that, in use, the outer circumference of the brackets are visible; the mounting means being largely hidden within the bracket or by the shade. In a particular embodiment, the fastening system is designed for use with motorized shades, wherein one mounting bracket is configured to key the shade motor, and one mounting bracket is configured to receive the idler pin.