Never seen anything like it. With this disc we cut metal pipes with a diameter of 1.5 mm. Less than 100 cuts. We tried this brand, not our previous one, Lenox. The Lenox brand existed for several months. The teeth on this blade did not wear out, the back of the blade cracked and broke off. This isn't the first blade we've ever used. The blade was no stronger than the Lenox. That just looks too complicated to me. I do not recommend it and will not buy it again.