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Here it is in a nutshell:

SR77 is a derivative of S7. S7 is used in the manufacture of jackhammer bits. It's lateral strength is second to none . . . not even INFI. But it doesn't hold an edge as well as SR101 or INFI.

SR101 is a derivative of 52100. 52100 is used in the manufacture of ball bearings. It's lateral strength isn't quite as good as SR77's or INFI's, but it will hold an edge longer than SR77 and some say INFI as well.

INFI has SR77's lateral strength, SR101's edge-holding capability, and better corrosion resistance than either one.

Hope that helps. <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />

Perfect reply. Stated wonderfully. <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" />

JYD #59 1LT Clark Tucker OD, Platoon LDR US Army