High Quality MaterialThe Lamp Shade Adapter Rings is made of high quality sturdy hard ABS plastic, which is durable, not easily deformed and last for a long time. High Temperature ResistantMax 210 Centigrade heat-resistance made the lamp shade reducer rings will not warp or melt due to heating, they have strong insulation, high temperature resistance. Product FeaturesLight Shade Reducer Ring Converter are used to mount E14 screw lamps to E27 lampshades, one of which is an open design, so you can adjust the ring to fit the E27 lampshade. Widely UseCompatible with most European bayonet headlamps, lamp holders, desk lamps, ceiling lamps and small converters, it can help you solve big problems. Package IncludedSet contains 3 different styles of Plastic Lamp Shade Reducer Ring, including 4 x E27 To E14 Lampshade Reducer Ring and 4 x E14 Screw Collar Ring. The Lampshade Reducer Ring all have an inner diameter of 29 mm.