* Distance(mm) Rockwell Scale: C 0.00 54.20 1.59 55.55 3.17 53.60 4.76 54.20 6.35 51.70 7.94 50.90 9.52 53.80 11.11 54.10 12.70 54.80 14.29 54.50 15.87 55.00 17.46 54.90 19.05 54.30 20.64 54.80 22.22 54.20 23.81 54.40 25.40 54.30 31.75 55.10 38.10 54.40 44.45 54.10 50.80 54.40 63.50 52.70 73.02 52.90