SmartDealsPro 6-Pack White Intermediate E17 Base to Candle Candelabra E12 Base Light Fixture Bulb Socket Adapter Reducer Intermediate E17 MALE Base to Candle Candelabra E12 FEMALE Base Made of aluminum and molded plasticMaximum wattage is 75 Watts For use with bulbs which have a e12 head and want to change this e12 head to e17 head 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. For another solid PBT style please see ASIN B00RCBPVSG.