DuraGRIT does not recommend the use of the DuraDISC 5" carbide sanding disc (DB-DS5) on angle grinders.

The max tested speed of the 5" carbide disc is 1750 rpm.  

That is for use on Random Orbital Sanders and belt/bench disc sanders where the backing is rigid.

(Please note the vacuum hole pattern is compatible with most 5" diameter sanders with a 5 or 8 vacuum hole pattern, but not Festool® orbital sanders)