Great set of blades, spacers and shims. Handled my first job of 1/4", 1/2" and 3/4" dados with ease.  Comes with a handy guide for building your stacks. The spacers and shims aren't marked as such, but a few moments' thought solved the problem. The only real problem with this item is that the instructions are tiny to the point of being unreadable. A separate instruction sheet would be very helpful.