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