Abstract: A method for manufacturing a tool, liquid nozzle or corresponding product, in which one or more holes or openings of a desired shape are made into the product during manufacture. The hole or opening is required to have at least one of the following characteristics: interchangeability, serviceability, processability or mechanical wear-resistance, and to achieve this, the inner surface of the hole or opening is accessible in an appropriate manner. The product is divided into at least two parts with the dividing line arranged to run through the hole or opening in such a manner that in the product parts the hole or opening is open, such as an open groove, in which case it is freely accessible in each part.