H313012N … Drop Front Desk Flap Hinge in Nickel Finished Metal. All Metal Adjustable Drop Flap Desk Hinge. INDAUX Brand. Overall hinge measure 1-5/8 inches wide and approximately 2-5/8 inches long. 90 Degree Opening. Also often used keyboard tray and for heavier flaps. 6-way adjustable. Detachable for separate mounting on flap and shelf. Flap opens flush with shelf. Lipped edging conceals roughness of bore. No routing or mortising. Drill 35mm (1-3/8 inch diameter) hole, by 11mm (7/16″ Deep) and 11/32″ from edge. Boring setup is identical on both parts. All metal, Nickel Plated. Sold Each Not Pairs.