* Observe the surface - should be flat and smooth. also checking the backside ( the surface without labels ) to see if all the area with same color, if not means the abrasives density is different.
* Observe the edge - should be little bright.
* Checking the inner surface of the metal ring - if there are abrasives grain ? if so, then will have some problem when fixed to the angle grinder.
|super thin cutting discs|