You should know that already cause' I'm not going to tell you.
A half-inch diameter would be approximately 1.27 centimeters in the metric system.
4.6875 inches is approximately equal to 11.91 centimeters in the metric system.
10 inches is approximately equal to 25.4 centimeters in the metric system.
Half an inch is equal to 12.7 millimeters.
The metric unit of measurement similar to an inch in the English system is the centimeter.