Disclosed is a chain disk corner (200). In certain embodiments, the chain disk corner includes a bi-directional orientation independent chain disk corner wheel(1100). In particular, the wheel is molded and devoid of moving parts. In certain embodiments, the chain disk corner includes a window portion(702). In particular, a bottom housing (208) subassembly includes a bottom body (700) of an opaque material and a hingedly attached window portion. In certain embodiments, the chain disk corner includes a reinforcing washer(705). In particular, a top washer (302) is attached by injection molding to an interior of the top body, and/or a bottom washer is attached by injection molding to an interior of the bottom body. In certain embodiments, the chain disk corner includes a top surface (400) devoid of pockets. In particular, a top body includes a plurality of ribs (418) positioned at an interior surface (402) of the top body.
