Phive Heavy Desk Lamp Base for CL-1/LK-1/LK-2 Architect Swing Arm LED Desk Lamp, 7.8" Round (Silver) Suitable For Phive LK-1 Metal Architect Swing Arm LED Desk Lamp Fit lamps with 1/2"diameter post Heavy duty iron base weighted up to 5.2 pounds, no worry about overturn Non-slip mat keep the base stable Diameter: 7.87-inch