About the ShrinkIt archives;

CHINOOK35.SDK (3.5² self-booting 800k ProDOS disk)
CHINOOK525.SDK (5.25² self-booting 140k ProDOS disk)

Both archives have the same content.

This is for use with the old CHINOOK hard drive.
Itıs the only multi-function utility for this old
Apple II model hard disk drive.

Take your pick; the 3.5 disk - the 5.25 disk or both :)