NDS DS-200H - Dura Slope Ductile Iron FrameNDS DS 200H Dura Slope Ductile Iron Frame Dura Slope Ductile Iron Frame provides a Class D load rating of 326 575 psi and is suitable for heavy duty hard tire equipment at speeds less than 20 mph. The DS 200H Ductile Iron Frame is recommended for use with pneumatic tire traffic such as fork lifts. The ductile iron frame can be used with the cast and ductile iron grates. Note: DS 123 screws must be ordered to secure frame to the channel. IEZZJ61110