SmartDealsPro Black Candle Candelabra E12 Base to Intermediate E17 Base Light Fixture Bulb Socket Adapter Reducer (12-Pack) Candle Candelabra E12 Base to Intermediate E17 Base Made of aluminum and molded plastic Maximum wattage is 60 Watts When using these adapters, if you screw the bulb in as tight as possible you can indeed break this adapter off the adaptee bulb. This is tempting to do because the adapter does typically add about a 5-7 mm gap between the adapter and bulb .... You so want to make it flush between the bulb and adapter. We recommend screwing in the adapter so the bulb comes on and not trying to make the bulb as tight as possible and making the adapter flush with the bulb.