No problem, online translate works:
"RT0701C only has official adapters for 8mm(763618-5), 6mm(763636-3) and 6.35mm(763637-1?). There are other manufacturers knowing that you will have a maximum of 8mm stem. If you want to work with other sizes compatible with the RT0701C, search for “ER11 Collets”.
In my case, almost all my drills are 6 or 8mm, I usually work with the CMT brand that is bought in a local store, I live in the Canary Islands.
Sorry, I don’t write well in English."
Use a lot of CMT bits myself