Introducing the Yocan Groote giveaway contest! The Yocan Groote Box Mod can safely and securely fit with most 510 thread atomizers. Groote Features Dimensions – 60mm by 28mm by 14mm Fit Your Favorite 510 Cartridges (diameter dimension Small and Compact Design 350mAh Battery Capacity How to enter this giveaway? 10 Ways to Enter this contest on Yocan official site. Here is the link: https://www.yocantech.com/yocan-groote-box-mod-giveaway-1st-round-of-aug.html Good Luck.