Actually, the concept of the guthook was patented in the mid-1870s; for gutting, but at the time, the idea never really took. At present I don't own any gut-hooked equipped knives- not really my thing. However, my Sog Powerlock has the V-Cutter on it- a tool I have found is easier for cuting zip ties with than a standard knife.What WL said. They were originally designed to lift cooking pots off of fires. Designed by some Alaska bushman fella. They are good for that I'll give them that. Other than that they ruin the look of a knife bar none. I feel like a parrot! keepem sharp