The Mainstays Adjustable 8? to 10? Brass Harp with Finial attaches to Spider fitting shades. Lamp harps are the metal wire lamp part that mounts below the lamps socket and supports lamp shade. The Mainstays Adjustable 8? to 10? Brass Harp with Finial is perfect for a wide variety size lamp and appropriate shade to reposition and give your lamp a quality adjustment. The Mainstays Adjustable 8? to 10? Brass Harp and Finial features a beautiful polished brass finish simple finial and the ability to easily adjust height of harp. The Mainstays Adjustable 8? to 10? Brass Harp with Finial helps takes the guess work out of finding the correct harp height for your lamp and shade. Easy to install.