NOTE SIZE - #1 lamp collars - Outside thread diameter - 7/8" (22mm); Overall diameter 2-1/2" (64mm) Prior to ordering insure that this is the size you need for your lamp. Theses Electric Converter Burner Lamp Kit allows you to create your own vintage-inspired chimney lamps with an antique finish. Each kit includes prongs for holding a lamp chimney and has the classic "oil burner" look, adding a touch of nostalgia to your home decor. The rotary style switch on the cord allows you to easily turn the lamp on and off, and the kit is designed to fit a candelabra bulb. These kits are UL listed and is suitable for converting one lamp. They are designed to fit a size #1 lamp collar. With these kits, you can give new life to an old lamp or create a unique, one-of-a-kind lighting piece for your home. Cord: 6' Burner Base: 2-1/2" Dia. Outside Thread: 7/8" Dia. THESE FIT SMALL # 1 LAMP COLLARS - THEY DO NOT FIT LARGER OIL LAMPS