Our WALL stainless steel slot drain system allows installation against the existing wall or foundation. The grate is made of stainless steel and has a standard length 3.3 feet. Grate's height is 4" and it connects to a 4" Basic PolyMax trench drain. Depth of a channel may vary: 2", 3", 4", 6" and 8" and it depends on project conditions. The size of grate opening is 5/8" and it widens to fit the channel. Due to its design, debris do not stick and easily pass through. Applications: pools, balconies, porches and everything where you want to avoid standard grating. Stainless steel provides chemical and corrosion resistance.