The 510 to 510 adapter is as alternative solution if certain atomizers or cartomizers are having issues whether it is clearance or airflow. This particular adapter is designed with cut outs for efficient airflow, unsealed (the center has a hole) and includes a ring that can be used optionally for airflow efficiency. While the ring is not attached with the adapter, there are 2 holes on opposite sides. Having an adapter can also be useful if you want to prolong the device threading itself.
Specifications: 1cm (L) x 1cm (D)
Note: You will receive  510 to 510 adapter.