Preheat water bath to your desired temperature using immersion circulator. 125 degrees F for rare, 130 degrees F for medium rare, 135 degrees F for medium, 140 degrees F for well done.
While the water bath is preheating, season the steaks liberally with kosher salt and black pepper. Add to a vacuum seal bag, keeping them separated if possible, and vacuum seal. Do NOT stack the steaks on top of each other in the bag.