<p>From 31 October 2024, BT Cloud has <a href="https://www.bt.com/help/broadband/bt-cloud/getting-set-up/download-or-access-files/how-do-i-download-files--folders-and-devices-from-bt-cloud-">closed</a> and all data will soon be deleted.</p>
The outer sleeve measure 5.5mm on my micrometer this would suggest that the inner is probably 2.1mm but my micrometer is not fine enough to measure inside accurately.