Thickness (mm)* I II III IV V VI VII VIII 5.49 6.37 7.29 8.34 5.64 6.31 7.15 8.48 4.78 4.76 4.80 4.76 2.25 2.39 2.28 2.37 Width at Mark 3 (mm) Mark III (5mm thickness) Initial Final 19.16 19.81 Mark VII (2.5mm thickness) Initial Final 19.15 20.61