This is how a lot of blades are sold new.Here is something that will mess with your mind but try it. Sharpen your blade, be it 30 degrees or razor sharp. Stand the blade straight up and run a grinder/sand disk lightly over the sharpened part of the blade. This will result in a squared off cutting edge which then creates 2 cutting surfaces instead of 1 if sharpened in the "Traditional Way". This will create an "edge" that will last a long time and will cut your grass like no other. Try it out and let me know.