Lamp or Clock Arm Back Solid Brass 7/8" with 1/8 IPS (3/8" Internal Diameter Straight Threads), threaded port through and 1/8 IPS (3/8" Outside Diameter) Male threaded port. The threaded nipples shown in the picture, are not included in this listing. They are for illustration only. 

Please look at the pictures for a better description.

Thank you for looking.

We combine shipping to keep cost to a minimum.