I routed the drain hose for my cowl grille down the firewall and out of the floor board. When I was doing the body work and patching holes, I ended up leaving this hole in the floorboard because it was a special hole. I wish that I knew the story behind the hole but I do know that the hole was put there by a 45 caliber bullet! That is why I left the hole and it worked perfect for routing the hose to the bottom of the Jeep.