All of our Uno lamp shades are available with either threaded or slip on fitters commonly called EURO or UNO lamp shades for bridge arm & gooseneck lamps 1) THREADED UNO: Threaded fitter 1.25" wide screws on the electrical socket for bridge arm & gooseneck lamps 2) SLIP UNO 1 3/8" Fitter: Large hole fitter 1 3/8" wide slips over the electrical socket, held in place by threaded ring for bridge arm & gooseneck lamps 3) SLIP UNO 1 5/8" Fitter: Large hole fitter 1 5/8" wide slips over the electrical socket, held in place by threaded ring for bridge arm & gooseneck lamps Order Quality Light Bulbs & Hardware |