Rancilio Rocky Grinder Burrs Pair 50mm 69-000-032 / 69-000-245

I was very excited to get the new disks. The old ones were very old - 20 years. But I noticed that the new disks ground down very quickly, to pretty much the same height as the old disks, within weeks. It would be great if the disks were a bit more durable. Coffee beans are super hard, so the metal should meet those demands.