Compatible with the standard 19 racks and cabinets to hold various IT, network and other equipment. No Lip at the Front for Saving Space and Adding an stiffener at the front making the shelf stronger 1.2mm Thick holding sides assure strength and Max loading weight capacity is 22 pounds, more than other cantilever rack shelves Product Size: 19in Width, 1U height, 10" (254 mm) deep, including 4 x M6 screws & cage nuts, 4 x M5 screws & nuts; Disassembled Shelf allows you to assemble according to your different usage, and Lip can be upside or downside for meeting different functions.