The only use of this knife is for cutting 45-degree edges on foam board (and why anyone would want to do that is beyond me). It is totally useless for anything else, including the mat board that I bought it for. The minimal instructions and diagrams are equally worthless.

This knife may be OK for foam, but it does not work for 45 degree cuts on mat board. It is flimsy; instructions are not included. I will return this item.