The Rat Thing is a 4.5 inch knife with a straight clip blade and partial false edge which can be sharpened. Made of selectively tempered 3/16" thick O-1 steel, with a tang fully enclosed in a fiber glass-epoxy composite handle. It is a great design.
The Rat Thing is an excellent design in a mid-size utility knife. One of my favorite of Mad Dog's designs, for sure. There are pictures around, I think Shannon Lew usually has some, does anyone remember the URL?