Schluter® KERDI-DRAIN Classic Grate Kit 4"The grate is the one part of your shower drain that people actually see and touch every day. Getting this right means picking the finish and style after everything else is decided tile, fixtures, hardware and then choosing the piece that ties it together. Product Overview The Schluter KERDI DRAIN Classic Grate Kit 4" is the visible top assembly for a 4" KERDI DRAIN installation. It includes the grate, frame assembly, and the height adjustment