Hi hope this helps

1 inch = 25.4 mm

so divide 25.4 by 16 this will give you 1/16th ( one sixteenth)

multiply that by 9 = 9/16th in mm

so 25.4 divide by 16 = 1.5875

1.58 X 9 = 14.2875

1 inch = 25.4 mm

so divide 25.4 by 16 this will give you 1/16th ( one sixteenth)

multiply that by 9 = 9/16th in mm

so 25.4 divide by 16 = 1.5875

1.58 X 9 = 14.2875