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Threaded: to screw into 7/8" lamp opening
Center Hole: threaded 3/8" - 1/8 IP lamp thread
Brass Adapter is a useful part typically used for a variety of applications. Use when converting oil lamp to electric. Screw adapter into #1 lamp collar. This reduces collar opening to 1/8 IP. Lamp socket is then easily screwed onto nipple.Brass adapter is also used on lamp socket clusters. In these applications the lamp shade extension screws into it.