Have used this exact blade 4 times in the last 2 years with good results and great value for money. Everything changed with the last blade. Maybe they have a new supplier or something, but the cutting surface was completely center free and the blade was polished to a mirror finish. Cutting took 5 times longer than usual and required much more power. I'm guessing it's either a defective blade or someone is cutting on the diamonds used in the manufacturing process.
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