Secure your grates to prevent displacement from heavy runoff flows, pedestrian and vehicular traffic, and to deter potential theft and vandalism when using the Dura Slope ductile iron frame. Our ¼ in. X 2-1/2 in. Phillips flat head screws fasten down all Dura Slope® grates to DS-200H iron frames. These screws have a sheared tip which allows them to easily thread into the receiving nut of the Dura Slope ductile iron frame . Each iron frame requires two DS-225 screws to secure the grate; one grate per frame. Use our 12 ct. bag of stainless steel screws to help an important part of your stormwater management product function effectively. Hassle-free limited lifetime warranty guarantees the NDS product is free from defects—or we’ll replace it.