Built from SSAB products, like Hardox steel. The grizzly built at MTS have been designed for heavy duty use and built to take the abuse from an excavator.  The design of the separation grates are stragetically designed for a long life, but also to avoid plugging.  In the case of a plugged screen, the operator can use the bucket to raise half the bars which pivot about the lower point.  This advantage allows two screening sizes, and allows the plugged material to easily fall away.