There are 510 to 810, 810 to 510 and 810 to 810 adapters, if you are looking for vape adapter, please check the details below, there is the one for you.
Colorful 510 to 810 Adapter for WISMEC Elabo Mini
Aluminum 810 to 510 Adapter for TFV8/TFV12
810 to 510 Drip Tip Adapter for IJOY Captain...