Cylindrical grader. Mckinnon cylindrical graders grades the coffee through a mixture of wire and perforated screen sections. The device is modular and individual, In construction parts can be replaced, Interchanged, Or redesigned. The category of coffee and amount of each grade determine the length of each modular section. An internal spiral conveyor conveys the coffee along the cylinder in a highly uniform manner. Cleaning brushes ensure maximum screening throughout every moment all sections consist of perforated sheets when no peaberry separation is required. The grader is configured with alternate wire and perforated sheets when peaberry separation is required. The graders are furnished with material feeder equipped with slide feed individual outlet, Regulation device hoppers for each section, Rails and hooks for bagging, And spouting for further transport. Cylindrical graders are designed for arabica beans alongside robusta varieties varieties. Input capability options differ from 200kgs on an hourly basis for 2000kgs per hour. Graders can be configured to give up to and with, Nine separations twin or triple deck for easy repass, And movement of coffee