2 Piece Threaded Socket. 

Antique Style Porcelain Socket with Standard Base.
For 1 7/16 Inch Diameter Hole With 8 Inch Leads.

Medium base E26 porcelain sign receptacle,
 2-piece ring type, 8 inch 105°C wire leads, 
660W, 250V, nickel plated copper screw shell.
UL listed.

Note: the third photo shows an old socket that 
this socket will replace with perfection.

Construction:  Porcelain.
Age: Brand New with Two Wires.