it was the economy line of king kutter blades, but my gosh, skimming a steel blade along a pine board, causing that kind of damage, makes you wonder if these blades are just meant to sit around looking pretty, or if they should be able to be used for what a guy buys em for, WORK!!! i try to use all my equipment in a way, that gets the job done, but at the same time does not abuse my equipment, and this was definitely the case in this situation. i could see it if i had really hit something substantial, but a board? gimme a break. anyway, lesson learned on my end. good luck guys