Phive Heavy Desk Lamp Base for LK-1 Metal Architect Swing Arm LED Desk Lamp, 7.8" Round (Black) Suitable For Phive LK-1 Metal Architect Swing Arm LED Desk Lamp Lamps with different size or weight may not suitable for the base. 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, 1/2"diameter post