They're definitely not high enough quality to be called a mountain bike crank. I bought 2 sets for 2 bikes and both left cranks fell off in just a few hours. Although I installed 1 myself and 1 was installed by a professional, the square mating surface was FUBAR. The chainrings are good but not worth the money. In general I would discourage people from using square taper bottom brackets and cranks, but they are particularly bad. They may be suitable if you drive exclusively on the road.
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