Fasten Dura Slope® channel drain grates securely onto Dura Slope channels and also the Dura Slope catch basin using ProFit™ Grate Locks. This unique component also prevents the channel from collapsing as concrete is poured. The Grate Lock clips inside the channel (or catch basin) and stays put; drain grates are attached to the integral frame using included screws. The ProFit Grate Lock is made of high-density polyethylene (HDPE) containing UV inhibitors.