Safco Products Adjustable Keyboard Platform with Swivel Mouse Tray 2135BL Black, Ergonomic, Tucks Under Desk, Slim Design SUPERIOR ERGONOMIC COMFORT. Safco Adjustable Keyboard Platform with Swivel Mouse Tray lets you customize height and tilt for superior ergonomic comfort. Foam wrist rest offers support and the mouse tray swivels out of sight when not in use. OPTIMUM KEYBOARD PLACEMENT. Adjustable keyboard platform tucks away under desk when not in use, freeing up valuable desk space. EASY ADJUSTING. Single knob adjusts height 5" (1 1/2" above desk) and tilt (+10 degrees to -15 degrees) for easy modification. ENHANCES POSTURE. Ergonomic tray promotes proper posture during typing and foam rest reduces wrist soreness with plush padding. Swivel mouse tray mounts on left or right for ideal placement. PRODUCT DIMENSIONS. Overall product dimensions: 18 1/2"W x 9 1/2"D x 3/8"H. Swivel mouse tray is 7 3/4" diameter.