Not very sharp to begin with and dull almost immediately. Metal cutting blades took a long time to cut through old nails. I switched to the dull blade of Diablo I had given up and it was the difference between day and night. 5 seconds to go through a nail instead of a minute. The final cut on 6x6 (started with a circular saw) with wood discs is exactly the same. I've tried both "wood" and "scoring" blades and they barely cut before the teeth are rounded. Diablo's dull blade, which I had not yet discarded, completed the cut quickly. save your money I tried probably half the blades in the set in a month trying to find something sharp and staying sharp, otherwise I would have returned the set.
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