The PL003-27 Keyboard platform perfectly designs for users to work easy and comfortable enjoying working with this technology.27" Rectangle Platform accommodates both the keyboard and mouse on the same level. The palm rest(s) allows for left or right-handed mousing. Made from black ¼" thin phenolic for maximum knee clearance. 27" Rectangle Keyboard Platform: ESI Ergo PL003-27.Attach the keyboard platform to the keyboard arm and track assembly using the four flathead screws and flange nuts. The flange nuts must be fully tightened to ensure the nuts are locked. Use a Phillips screwdriver.