This is how to grind your Gator blades to get great performance. I have been using them like this for 4 years. Grass clippings come out in smaller pieces then stock Gators plus it pulverizes the leaves. I have never had a problem with the discharge clumping or grass building up on the deck. I bought this set to be my swapping set but I think I am going to try them as doubles this fall. I know Gators web site said they don't need to be sharp but it does make a difference. Not only are the teeth moving the clipping back into the blade I think they now cut also. Plus the air flow is smoother with the sharpened edge. These pictures were taken before I extended and sharpened the cutting edge. They came with only 6" of bevel and not all that sharp. The last photo is of stock Gators.