My son is 19 months old and a big Handy Manny fan! He loves this book with its little tool shaped books.
It isn't a story, but has information about each of the tools, and bits of it are written as though each tool is talking - and they are kept in character very well. My son loves taking the tools out of the book and carries them around with him. They are such a perfect size for his little hands to hold, which I think is a big part of the appeal.
I recommend this book to any Handy Manny fan, or indeed any child who loves tools.