* Distance(mm) Rockwell Scale: C 0.00 57.40 1.59 57.10 3.17 57.40 4.76 57.30 6.35 57.30 7.94 57.40 9.52 56.90 11.11 56.50 12.70 56.50 14.29 56.00 15.87 55.70 17.46 55.30 19.05 55.20 20.64 54.80 22.22 53.80 23.81 52.50 25.40 51.50 31.75 45.10 38.10 40.60 44.45 38.60 50.80 37.70 63.50 37.60 76.20 37.50