3m Twin-Arm Sit-Stand Keyboard Platform Twin-Arm Sit-Stand Keyboard Platform Unique system keeps keyboard and mouse in position during adjustment or storage of trays. Independent mouse platfrom is height and tilt adjustable and can be mounted right or left. Patented leatherette gel wrist rests for keyboard and mouse; Precise™ optical mousing surface. Cord management. Completely smooth underside won't snag clothing. Easy one-hand adjustability with upfront lever that controls 15-1/2" height range and unlimited tilt adjustments. Designed for standard keyboards. Manufacturer's limited lifetime warranty. Workstation Type—Straight Glide Track Length—18" to 22-3/4" Tray Dimension—22-1/2 x 11-1/4 Wrist Rest Mouse Tray Dimensions—7 x 9-1/2 Mousing Surface Attaches on Right or Left Side Removable Mousing Surface Articulating Arm Height Adjustable (Above to Below Desk)—7-1/2" to 9" Sliding Tray Tilt Adjustable Swivel Keyboard Tray Black