Does not work well!
The size was exactly what I needed and I thought it was a cool idea to keep blades sharp. However, the side than is supposed to sharpen your blades is awful. Not only does it snag material, it ruins your cutting blades. I only had to ruin one to learn not to do that again. I use this ruler, but always turn it so that my blade NEVER touches the rough edge. Sorry Missouri Star, I usually love your products, but not this one.