THIS IS A NEW SURPLUS 5K OHM POTENTIOMETER, TYPE GC ON/OFF SWITCH RATED 3A. 125V,  1A. 250V THE HOUSING DIAMETER IS 7/8 X 5/8, SHAFT DIAMETER 1/4 X 1/2 AND THE THREADED MOUNTING COLLAR IS 3/8. THIS COMES WITH A NUT. THERE ARE MANY MORE IN STOCK.