Do you want to maximize cutting and reduce burr?  Choose Camel CGW 4 1/2" diameter Quickie Cut Rigid reinforced extra thin cut off blades A36T made of Aluminum Oxide.  Style:  Type 1 (flat center), rigid and extra thin (.045 thickness).  These wheels are thicker then the A60T, providing faster cutting and still provides a long  wheel life.  Also provides less vibration.  Grain Size:  Medium;  Grade:  Hard.  For right angle grinders.  Application: metal and stainless steel.