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as long as the word Sweden is on the bottom of the blades, you will be fine...I have a 7" with Swedish blades that cuts through the ice like butter 12" ice today, about 10 seconds drilling through it.
Spot on. I have a 15+ year old mora 4 inch that cuts like a champ, with the swedish blades
I plan on handing it down to my kids in the ne'er future