And that is why I could not even fit a simple 22g parallel in mine, the rda is over priced and limited on builds that can be installed. They designed is for one purpose while pushing on another mod it does not work best on for certain people. Post holes where also too small as well limiting wire gauge, this is over a $300 set up. My 22mm Subzero rda was much better for quick builds as well as a Kennedy 22mm.