The Metal Adjustable Arm Clamp provides a sturdy and reliable way to secure one of Studio Designs" lamps to any desk. The clamp easily attaches to the bottom of each lamp and fastens tightly to any Studio Designs" table. Made of powder-coated steel, this clamp ensures lasting durability. Works with the Studio Combo Lamp #12315 & #12316, Swing Arm Lamp #12021 &12023 and Magnifying Lamp #12309