The 30 in. x 60 in. Single Threshold Shower Floor in White is made of durable molded fiberglass material to directly replace a bathtub and offers a left-hand drain opening that is offset 15 in. x 8-1/2 in., the same as a bathtub. The shower floor meets ADA specifications 07/01/1997 and can be used with wall materials such as Durawall shower walls (not included).