Mapei 1215000021 Tile Mortar, Gray, Powder, 50 lb, Bag

Ker 121 is a professional-grade, single-component, high-performance mortar for the installation of ceramic, marble, granite and porcelain stoneware over most traditional and specialty substrates. Ker 121 can be used for most interior residential floor and wall tile applications. In commercial applications, use on interior floor and wall installations as well as exterior floors.