This is a genuine original Mira Daryl part for Aroco shower doors. It is a single roller assembly designed for sliding and quadrant shower doors. The part number is 208499 and it replaces the previous part number 204763. This roller is suitable for the Daryl Aroco 816 Single door Quadrant, Daryl Aroco 891 sliding door, and Daryl Aroco 896 quadrant (both lower and top half views). It may fit other models, so please inquire if unsure. The roller is constructed from high-quality ABS plastic with ultra-smooth roller bearings for durability and smooth operation.