What's better than one banger nail? Two banger nails! It features a state-of-the-art twin banger nail design. One banger nail is solely connected to a central airway, while the other is fused to it with a glass tube. This glass tube acts as a secondary airway and guides the vapor into the main airway, which then directs it into the rig. This well-engineered design allows for both banger nails to be used simultaneously. For convenience, this Dual Banger Nail comes in different joint sizes and genders: 14mm Female, 14mm Male, 18mm Female, and 18mm Male.