Press this radio button to use Centimeters as the units for the Workshop Rulers. Press this radio button to use Meters as the units for the Workshop Rulers. Press this radio button to use Inches as the units for the Workshop Rulers. Press this radio button to use Feet as the units for the Workshop Rulers. Cancel Button Press this button to exit the dialog, ignoring changes. OK Button Press this button to exit the dialog, using the indicated Ruler Units setting.