Mapei Keraflor Gray Floor Tile Thin-Set Mortar is a 50lb bag of dry-set mortar for use in interior/exterior residential floor applications.FEATURES AND BENEFITS•For tile and stone •For interior floorsWHERE TO USE•Most interior/exterior residential installations on floors when mixed with water•Most interior/exterior residential and commercial floor installations when mixed with Keraply•Installation of ceramic tile, quarry tile, pavers and Saltillo tile when mixed with water•Installation of ceramic and porcelain tile, quarry tile, pavers, Saltillo tile, and most types of marble, granite and natural stone when mixed with KeraplyPrior to beginning your project, please consult the manufacturer's installation guide