These are new zinc castings made in the USA. I am clearing out old inventory and found these packed away.  Perfect for a table lamp, 

SIZE:  5-5/8" Square, 1-1/2" Tall,  Top: 4-5/8" Diameter Rim

Center hole slips 1/8IPS (3/8" lamp pipe),, Wireway hold on the side. 

Please see pictures for details.  

I will combine shipping costs for multiple purchases. Please visit my eBay store for more lighting parts and unique finds.