Socket Knurled Turn Key Knob Solid Brass 1 1/4" long 4-36 Threads.    The Turn Key will fit any standard Medium Base Light Socket E-26.  
These Turn Keys are unfinished brass and will form patina with age. 
Storage may result in patina which may be removed if desired with Brass-o or some other brass cleaner. 
Please look at the pictures for a better description. 
Thank you for looking. 
We combine shipping to keep shipping cost to a minimum.