This brand new NOS brand Lighted On / Off Arming Rocker Switch for your nitrous kit or heater installation; the mounting shank diameter is 7/16 inches in diameter.   FREE SHIPPING TO USA ADDRESSES----------Current Jeg's catalog price is $13.99.  See my other auction items for more good deals on nitrous and hot rod parts-------------you may also call the shop at 702-596-2616 with questions.   PLEASE BUY WITH CONFIDENCE;     MY FEEDBACK IS ALL FROM BUYERS!       CHECK WHAT THEY SAY ABOUT MY SAME DAY SHIPPING WITH TRACKING!