The diamond disc seems to be of excellent quality. The Diamonds are about 0.5mm big. In the Picture you can see a hair for scale. The flange can probably be reused with normal angle grinder discs with the usual 22.2mm hole.
I use it with pleasure for grinding minerals. To be honest I expected less from this grinding disc. Just have in mind its diameter and that the machine you use it with should be with adjustable rotations per minute, because the normal angel grinder has 12000r-min and it's not quite suitable.