The Extron RSF 123 Rack Shelf Kit holds up to four quarter-rack width, or eight eighth-rack width, 1U high, Extron products side by side. The shelf is 3.5 inches (8.89 cm) deep and includes three false faceplates: one eighth-rack width, one quarter-rack width, and one half-rack width which are used to hide open slots once product is placed on the shelf. The shelf is designed so that the underside of products mount to the shelf using the included hardware. Available in a gray powder coat finish.