The Tsunami RDA by Geek Vape features an innovative two-post build deck, conceptualized airflow style (similar to Kennedy RDA), spacious build chamber, rectangular post terminals with high-quality set screws, and 510 drip tip adapter to accommodate three included drip tip. Tsunami RDA by Geek Vape Product Features: Improved Velocity Style Deck Adjustable Kennedy Style Airflow Single Coil or Dual Coil Mode Various Drip Tips PEEK Insulator 4.0 mm SS316 Post Screws 2.1 mm Post Holes 7.9 mm X 3.5 mm Bottom Airflow