These adapters allow for a battery with a 510 connection on it to connect to other models of atomizers. The adapters will allow for a kr808D-1 cartomizer to fit on to a 510 battery or mod unless it has a colour stated in the description (i.e. the black ones do not work with the cartomizer).
510 to eGO adapter - This allows for the use of 510 fitting cartomizers and atomizers with an eGo style screw in skirt to be used on 510 devices that do not have a raised crown (for example, the lavatube).
V2 510 Shorty Extension Sealed - Sealed version of this extender, useful for giving additional height to to a thread or to protect an underlying thread of an expensive device. Also useful for use with those atomizer/cartomizer that don't seem to fire on some devices due to centre pin issues. If you use a 510 model, you should have at least one of these handy. Due to this extender being sealed, it will protect the underlying battery or mod from juice leaks but will not work on batteries that require airflow like an auto battery.