Compx Ergonomx C400 Slide-Out Keyboard Tray Storable Keyboard Tray W/Mouse Tray Black polymer keyboard &amp; mouse tray for 24" opening Keyboard surface will accommodate standard or ergonomic keyboard shapes inside tray 8-1/2" x 19-3/4" RIght or left mounting mouse board Molded wrist pad with integral pencil tray with flip-top cover