We are all different when it comes to how close we want to be to our monitors but for most of our customers, the 28" x 24" work surface is large enough. For those who use extremely large monitors with our adjustable height desk (over 24 inches diagonally) it may seem like you are too close to the screen, so for that reason, we offer an extension that will add 9 inches to the work surface. These extensions measure 28" wide x 9" deep. If you need an extension that is larger than 9 inches, just give us a call. The extension will match the finish of your standard work surface and require no tools to put on(requires phillip head screw driver for permanent installation).