Note: please pay attention to measuring the size of your bulbs' round head and select the right type of reducer ring; Dimensions: the outside diameter measures about 6 cm, inside diameter is approx. 2.9 cm and height is approx. 0.4 cm Features: the metal lamp shade reducing ring can help the unsuitable lamp shades Wide application: converts European and Continental lamp shades to British lamp holder size, and this lamp shade reducing ring can work for round head bulbs of various types, helping to fit different lamp holder sizes Warm notes: the lampshade is larger, it is not suitable for resting the smaller light bulb; Install the reducer ring can help you use a small bulb Quality to use: the lamp ring is made of metal, fits on lampshade better than plastic ones, quality to use and last for a long time, Manufacturer: Chuangdi