BONTEC Ergonomics Desk Extender Tray, 9.5"x9.1" Table Mount Arm Wrist Rest Shelf, 90° Foldable Elbow Arm Support, Clamp on Computer Arm Rest for Desk, Suitable for Office Desks. Manufacturer: BONTEC. Sturdy structure can securely hold up to 33 lbs with the size of the support board 9.5"x9.1".
eBay