UNIVERSAL: The 18" 2U rack mount shelf works great for all 19 inch server rack , IT, data, router,AV cabinet and other networking equipment. MAXIMUM AIRFLOW: Vented design allows for the heat dissipation , keeping the using space cool and the service life of the equipment also can be prolonged at the same time. STURDY & DURABLE: This 2u vented cantilever tray with 2.0 mm thickness features good quality SPCC cold rolled steel, ideal for server and normal network devices with width less than 19. HARDWARE INCLUDED: Comes with one piece of 2u 18" rack shelf, all the mounting M6 screws ,cage nuts in one packing box. EASY TO INSTALL: With all included hardware, it's esasy to install within a few minutes.