In USA, the standard handles hole distance are given in inches. For example 3 3/4″, 5″ etc. The metric measurements in mm are exact and the inches are approximates.  Please do not confuse approximates as “close enough”; rather if the handles say 3″, 3 3/4″, 5″ etc …, the holes on our jig matches exactly with the holes of the handles the manufacturer publishes.