Secure your grates to prevent displacement from heavy runoff flows, pedestrian and vehicular traffic, and to deter potential theft and vandalism. Our ¼ in. X 1-1/2 in. Phillips flat head screws fasten down all Dura Slope™ grates to Dura Slope channel drain ProFit™ grate locks. These screws have a sheared tip which allows them to easily thread into the receiving nut of the ProFit grate locks. Every 4-ft. Dura Slope channel includes four ProFit grate locks each with a #629 screw. Use our 40 ct. bag of stainless steel screws to help an important part of your stormwater management product function effectively.