Thickness (mm)* I II III IV V VI VII VIII 5.73 6.36 7.20 8.23 5.61 6.45 7.44 8.33 4.93 4.96 4.97 5.01 2.50 2.52 2.47 2.46 Width at Mark 3 (mm) Mark III (5mm thickness) Initial Final 19.15 19.79 Mark VII (2.5mm thickness) Initial Final 19.24 20.66