Add a selection box to the hole command that allows the selection of a specific hole size based on a drill size.
Drill sets are available in fraction, number & letter and metric. It is common practice to specify on a drawing the drill size to use for a particular hole.
When dimensioning an imperial drawing with a hole that is 0.1575" the practice is to specify a 4mm drill. This makes life much easier for the person interpreting the drawing.