A nail refers to a component of a dab rig that holds the cannabis concentrate that is heated up, usually with a small hand torch to sublimate the concentrate into a vapor for inhalation. The nail that holds the concentrate is similar to the bowl in a bong, holding the product for consumption. Nails used to be mostly made of titanium, although more options exist today with glass, ceramic, or quartz options which are generally preferred. Some nails use a glass dome to help regulate airflow after the nail is heated, although many are domeless and work effectively with a carb.