Valued in conjunction with eccentric sander Master-Craft MES480E, 8 hole. (Exactly matching mounted) The discs fly unfortunately after a very short time from the device and are no longer usable, although the abrasive coating is still almost unused. The Velcro grinding wheel covering no good at all. For me bedeudet the waste of money. I recommend every buyer once try a small number of discs before ordering more. Best Währe if Amazon would recommend appropriate grinding wheels for each device.