I bought it on the advice of the seller for chasing in a reinforced concrete wall for wiring. Before that, I mainly used universal discs. I put the Metabo MFE40 on the wall chaser and there was no limit to my disappointment ((((the discs barely coped with the chasing 2 meters deep 20mm and practically stopped sawing. With breaks of 10 minutes, I finished sawing another 50 cm (I saw that one disc was pretty burnt) and put " used "universal cars, with which I finished the remaining 10 m. strobes. In short, these disks do not fulfill their purpose and saw reinforced concrete at the level of disks for 150-200 (but not 1200). In short, I strongly do not recommend. I am attaching a photo of these disks after 2, 5 meters of strobes in reinforced concrete, who understands everything will understand for himself when he sees it.