Do you want more strength then the Quickie Cut blades?  The perfect choice is Camel CGW 4 1/2" Extra Strength reinforced Aluminum Oxide cut off blades, A36S.  This is a Type 27 (depressed center), 3/32" thickness, with or without hub.  7/8" arbor.  Grain Size:  Medium; Grade:  Hard; Applications:  metal and stainless steel.  For Right Angle Grinders.  Also used for notching.