This thing is cumbersome to use. The corner lead they give you is a joke. It won't help at all, believe me. The only way to really use this thing is with about 6 months of practice and dedication, which I don't have. The silicone base doesn't hold the thing at all either, it slides all over you. You'll need a block of wood for the base or something heavier because that silicon thing won't cut it. The stone itself seemed good, but very, very thin, intended for knife sharpening, not profiling.