The present disclosure refers to an assembly for a dosing system of a spreadermachine for distributinga granular material or the like, comprising: a first member provided with afirst opening, asecond member provided with a second opening, and an actuator connected to atleast one of thefirst and second members and configured to provide a driving force forrelative movement betweenthe first and second members, thereby, adjusting an opening size of a dosingopening providedby an overlapping area in which the first and second openings are overlapping.The first and secondmembers are moveable by the relative movement into a first position providingthe dosingopening with a first opening size and a second position different from thefirst position and providingthe dosing opening with a second opening size different from the first openingsize, wherein acenter portion of the dosing opening is locally fixed when the first andsecond members are movedbetween first and second positions. Further, a dosing system for a spreadermachine for distributinga granular material or the like comprising the assembly is provided. Aspreader machine fordistributing a granular material or the like is provided.
