What are the read and write speeds of this SSD enclosure?

It supports read speeds up to 1,000 MB/s and write speeds up to 800 MB/s.

What type of M.2 SSD does this enclosure support, and what is the maximum storage capacity it can hold?

This enclosure is tailored for M.2 2230 SSDs and supports up to 2TB of storage.

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Nusyn NSE32 2230 M.2 NVMe SSD Enclosure 10Gbps USB 3.2 Gen2, M Key/B+M Key, Up to 2TB, Portable External SSD Case for MacBook/Laptop/iPad/Android