Do you want to maximize cutting?  Reduce burr and vibration?  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), 7/8" arbor.  These blades are thicker and coarser then the A60T, providing faster cutting and a long blade life.  Also provides less vibration.  Grain Size: Medium     Grade  Hard.   For right angle grinders.  Application: metal and stainless steel.