The Hatty RDA by Blitz Enterprises is bound to be one of the most popular RDA's, which utilizes a Velocity Style deck with unique airflow. With 3mm post holes for your most intricate builds and a unique side and bottom airflow design, you will definitely experience top notch flavor and vapor production. To ensure that your your coil leads are securely clamped down for optimal connection, the Hatty RDA uses Philips post screws instead of hex screws. Both single and dual coil builds are compatible by adjusting the side airflow accordingly and is also compatible with hybrid mods since the gold-plated 510 pin is adjustable. Much like the Velocity RDA, the Hatty RDA features a locking barrel to ensure that your airflow holes are always aligned with your coils.