* Distance(mm) Rockwell Scale: C 0.00 51.50 1.59 53.00 3.17 54.60 4.76 56.00 6.35 56.00 7.94 55.50 9.52 56.30 11.11 56.30 12.70 56.00 14.29 56.20 15.87 56.40 17.46 56.80 19.05 56.80 20.64 56.50 22.22 56.70 23.81 57.30 25.40 57.30 31.75 57.10 38.10 55.20 44.45 51.50 50.80 51.80 63.50 44.40 73.02 38.20