They seem to last longer than others I have purchased for more money. Cutting 1/2 inch steel boltsThe best balance of price, longevity and capability.Not sure why, the thing fits . . OK . . but the chuck doesn't seat all the way down on these blades like on the Dewalt blade, haven't noticed a problem with them being loose, but it looks like the die stamping is slightly off, for the chuck in the Dewalt tool anyway. Emailed the factory, about it, don't know if it was Covid or what, no reply . . . I mean that's WHY I try to buy American, right???I got these to try on hardie siding and they didnt work well at all. Normally I purchase the carbide teeth ones but wanted to give these a shot. That was a mistake. Ill continue to purchase the bosch carbide teeth blades for these types of repairs. The only good side to these was that they fit the dewalt tool very well.You have to shop around, but when I see a deal on these I grab them. As a general contractor, 10 of these will last me easily a year or more being selective on what I use them on.I don’t waste these on work that I should be using a reciprocating saw or jig saw. You’ll just waste your money if you’re too lazy to be using the proper tool.If all you need to cut is a few small nails off on the project your working on then this is a bargain. However, I bought 6 of these and went through all 6 after cutting about 150 staples that were holding down the hardwood floor I was salvaging. I went to Home Depot and paid $25.00 for a single Bosch blade designed specifically for cutting through nails and staples and was able to cut through about 500 staples with it before some of the teeth started breaking off. So I went to Lowes where they had a Dremel blade for $20.00 designed for cutting through nails and I was able to remove the remaining 300 square feet of hardwood which had approximately 1000 staples and it cut all of them with ease and shows no signs of wear and tear. I believe I could cut 800 more staples off!Here's the bang for the buck:Imperial cost $5.00/blade and cut about 30 staples before puking all of its teeth out. Cost of operation = 17 cents per staple cut!!Bosch cost $25.00/blade and cut 500 staples before teeth started breaking off. Cost of operation = 5 cents per staple cutDremel cost $20.00/blade and cut 1000 staples and still has all of its teeth. Cost of operation = 2 cents per staple.I'm guessing I could cut at least 800 more staples off with this Dremel Blade which brings the operating cost down to just over 1 cent per staple cut off.The blades are really good quality. They cut wood and nails very well.Excellent, highly recommended.I was expecting better when it came time to cutting ducting. Not sure if the spread of the teeth impairs performance VS bi-metal blades.But overall it's good. I dont know how long it will last though, just got them. Will update!Great cutting ability, best that i have used and price is fantastic, one negative is that for me it vibrates a lot more than other blades on my Milwaukee, small price to pay and definitely recommend.Cuts duct work like a dam. Not sure how long they last. Don't care, as long as they are good enough for job I am doing. Love them.Works goodThe best Blades