Seems to be of high quality. Fast delivery to Saint-Petersburg
After about 5 mm into sheet steel ( with cooling liquid of course) d20 got of its teeth shorn off. Looks like they are too brittle to sell to respectable companies so people peddle them on dumpsters like Aliexpress for a little less. H opefully I will be able to drill a couple of holes with the remaining ones, all in all a complete waste of money.