Directional flow carb caps allow you to direct the airflow into the corners of your quartz banger Dab Rig Tools Directional flow carb caps allow you to direct the airflow into the corners of your quartz banger to move around any left over concentrates. Doing this ensures that all of your concentrates are vaporized and nothing is wasted. Carb Cap Features: Use: Concentrates Air Flow Control Made of Quartz Fits on Quartz Banger Nails