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My Bosch jigsaw and these blades are such an improvement over my old (like 40 years old) Black and Decker that my professional builder friend who is helping me remodel my house was very impressed. I used it mainly to cut composite decking at first and the blade seemed to last forever and it even cut Hardy Plank siding for small holes when needed (even though it dulled pretty quickly as does every other blade on this cement -based product).Great blades.
5 stars if they came in 145 or 155 mm lengths for sandwich materials, as Festool blades do. Bosch blades are still great. Actually these blades DO fit a number of other jigsaws. Good blades, but Festool is 1 lb lighter and has a true dust extractor system, AND takes a Collins coping foot (which the Bosch 1590-1591 will not). Use them with other saws, too.
For this job, I always clamp the metal down to a piece of scrap plywood then cut through both metal and wood with one of these blades using a mid-range orbital action setting on the jigsaw. I wouldn't put anything but genuine Bosch blades in my Progressor jig saw. These blades go great in my Bosch Progressor jig saw when its time to cut sheet metal. By going slow and careful, this produces clean and fast cuts in the sheet metal without the vibration and noise you get when not using a backing material.
Just purchased my second Bosh jig saw not only because of it's endurance and smooth running capacity, but also because no other saw will use these Bosh blades. After 20 years of building I have never used a finer cutting blade.
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