Combination tools are applicable for equal or very similar parts that exist in various sizes or lenght. For example the rails on the picture that are made in 3 different lenght. The advantage of this tool is that the dimension of the raw material ist the same for each part. Therefore the sourcing of the material can be bundled to get better pricing. Combination tools are also used for parts with LH/RH character, parts of the tool can be used for both sides.