Trieur is used to separate broken, round and long grains and mixed unwanted grains like barley, rye, oat in wheat by their forms and sizes. That rotating drums which has cylindrical form, has selector inner surfaces and thanks to this selector, unwanted substances separating from other grains and sent to trough into the drums and they transports to outside by spirals. Separated grains, goes to exit way and the seperating operation has be done. Trieur’s selector sheets has variable sizes for use different purposes.