SPECS Material - Glass  10mm Female - 14mm Male Also Known As Glass Adapter Glass Reducer Description Considering that every smoker has their own preferences, no bong or rig is perfect for everyone.  Despite this, you don't have to accept a disappointing experience. By using bong dab adapters and converters, you can change how your tools work. The glass reducer is used to convert 10mm bangers to be used on a dab rig that has 14mm openings. Recommendation If you need a different-size glass converter adapter, you can check out our full line of glass adapters. FAQs What Is This Reducer Made From?  This reducer is made from high-quality borosilicate glass.