Guard your drainage system and keep leaves and debris from infiltrating with the trench drain grate. This stainless steel grate has a perforated design, with the perforated holes measuring 0.25 in. wide. The drain cover features an open surface area of 20.77 sq. in. per meter and flow rate of 63.6 GPM. Grate is rated NDS Class C when properly installed. ADA compliant and heel proof. One 1-meter (39.37 in.) grate covers one BG-FILCOTEN 100 4 in. trench drain; also available in a 1/2 meter (19.69 in.) size.