Durabase is made with a molded fiberglass composition and features 1-piece construction with ribbed underbody for extra strength. Smooth, semi-gloss surface is easy-to-clean. Molded-in drain includes removable matching plastic strainer plate and works with 2 In. PVC-DWV, ABS, or cast-iron pipe. Drain is located in center of base. Overall height of base is 5-1/2 In, height to top of single threshold is 4-1/2 In. Wall set not included. For a complete set: side walls (700.2W), back wall (748.34W), or adhesive wall set (247WHT).