* Distance(mm) Rockwell Scale: C 0.00 50.90 1.59 85.90 3.17 59.90 4.76 45.00 6.35 61.10 7.94 55.20 9.52 55.40 11.11 55.60 12.70 56.40 14.29 55.20 15.87 56.80 17.46 57.10 19.05 55.00 20.64 54.80 22.22 55.30 23.81 58.30 25.40 56.20 31.75 56.90 38.10 56.50 44.45 57.10 50.80 56.60 63.50 57.10 72.23 52.40