These are the original shrinkit archives that I created on my Apple //gs when I extracted these disks.
I had a lot of disks to go through with two sides on each disk, and I may have made a mistake when extracting these SHK images, so I figured it would be safer to save the .SHK files so they could be referenced later.
Once someone verifies that the extracted images are correct in the previous folder, these can be safely deleted.