Compatible Upgrade for: iMac19,2 - A2116 - EMC 3195   Early 2019  21.5--inch  4K
  How to find Model ID   Installation videos
Standard Memory: 8 GB
Maximum Memory 64 GB DDR4 2666MHz
Note: Although Apple officially reports that this RAM is "built into the computer" it actually is installed in two needlessly difficult to access SO-DIMM slots.
The following items are also compatible with this product...............................
External Hard Drives Installation tools SSD Storage Cards

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You may need a tool kit to install memory on this iMac