Our new commercial deck and concrete drain uses a spun copper drain basin and flashing made of 20 ounce copper. Choose from grate sizes of 6"x6" square, 6" round brass or 5" round nickel bronze. Grate height is adjustable from 1" to 2.25" (Additional Grate Extenders available for purchase) Weep holes are incorporated into the design allow for moisture to drain.Designed for use with deck and balcony installations20 ounce spun copper seamless flashing and drain basinGrate height is adjustable from 1" to 2.25" (Additional Grate Extenders available for purchase)2", 3", or 4" Bronze No Hub Fitting (5" round grate only available in 2" or 3" pipe size)Choose from a 6" x 6" square brass grate, 6" round brass grate or 5" round nickel bronze grateWeep holes for concrete and tile moisture drainageManufactured in the USA by Thunderbird Products