The Empire Glassworks Sushi Carb Cap is made to fit most quartz and titanium banger nails. Handmade in the USA with American glass rods. Features a fun sushi roll design perched on top of a transparent carb cap. These caps give you directional airflow while you are dabbing that helps ensure that you get the most efficiency with your concentrates and they get completely vaporized. Diameter measures 32mm wide.