I have no idea how long they will last. I know I can't find blades, individually or in sets, at my local centers and tool stores that include Harbor Freight at a ridiculous price. I was working on the project when they arrived. I attached one to my multi-tool and immediately used it to cut plywood while I was renovating my wife's chicken coop. The blade I used was at least as good as any blade I've bought before for cutting wood materials. When I was done the blade still looked like new. I love having a massive selection of blades in my box for my next project, whatever that might be.
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