Vintage 4-inch Round Marble Lamp Base for Restoration - Made in Italy (PORTORO) NEW OLD STOCK,3/4  inches deep.The Base has a recess bottom and a 7/16 hole in the center for a 1/8 IPS pipe.😃(Note that this base has no wire way)Please view all the photos and always be free to ask questions.(PLEASE NOTE THAT VEINING IN GENUINE NATURAL MARBLE IS UNIQUE TO EACH BASE).(SOME BASES HAVE MORE GRAY OR GOLD VEINING AND SOME LESS).