Protect your drain system from pipe-clogging leaves and debris with the trench drain grate. The galvanized steel grate has a perforated design, with each perforation or hole measuring 0.25 in. wide. The drain cover has an open surface area of 20.8 sq. in. per meter and flow rate of 64 GPM. Rated NDS Class C when properly installed, ADA compliant and heel proof. Use two 1/2 meter (19.69 in.) grates to cover one BG-FILCOTEN 100 4 in. trench drain. Also available in a 1 meter (39.37 in.) size.