* Distance(mm) Rockwell Scale: C 0.00 60.60 1.59 60.30 3.17 59.90 4.76 60.40 6.35 60.30 7.94 60.60 9.52 61.00 11.11 60.90 12.70 60.50 14.29 60.40 15.87 60.30 17.46 59.70 19.05 83.70 20.64 59.60 22.22 59.00 23.81 59.20 25.40 58.80 31.75 57.80 38.10 55.40 44.45 53.00 50.80 50.30 63.50 45.50 71.44 44.00