EASY INSTALLATION - Converts your Standard "Spider-Fitter" Lampshade to fit on Slip Uno Lamp Base Lamp. Easy DIY upgrade project. MEASURE YOUR SOCKET - Uno opening is 1 7/16" which is the most common size, so be sure to measure your bulb socket to make sure the diameter is less than 1 7/16". Kit is designed for lamps with a plastic ring to hold the shade. See pictures to to confirm this adapter will work for you. FINISH - Polished Brass finish USE FOR - Works best with spider-fitter lampshades that are about 16" tall. A slip uno harp is generally 3" shorter than the lampshade, provided the shade "drop" is 1 inch. (drop is the distance from the top of the shade to the center washer. QUALITY - hardened steel construction. Durable steel with brass finish, this will be the last harp fitter you will ever need to buy. This Slip Uno Adapter Converts your Standard Lampshade to fit on Slip Uno Lamp Base. Did you ever have trouble finding an UNO fitter shade? This is common because most replacement shades have standard spider fitters (aka washer fitters). Will this fit your lamp? Our Uno opening is 1 7/16 which is the most common size, so be sure to measure your bulb socket to make sure the diameter is less than 1 7/16. Slip Uno adapters are made to fit directly over a plastic lamp socket found on lamps usually purchased at many popular retail stores. Uno fitter shades are difficult to find, so this adapter lets you use standard washer fitter shades on your uno lamp base. This adapter attaches directly to the harp, allowing use of nearly any replacement lamp shade. Harp is 13 tall and the height from the bottom Uno ring to the top plate is 13, so this fitter works best with shades that are about 16 tall. Polished brass finish.