Our Waring Pro blender blades broke. I’m not really sure I understand how the asshat idea of these blades were approved. You can’t tighten the blades, they spin freely. The rod they’re connected to spins from the base, however, since the blades can’t be tightened if there’s an object in the glass the blades do nothing while the rod spins. My only guess is that they had a small spot weld somewhere and that came loose. That being said, 50 dollars is a pretty good price.