Comfortable, blow-molded seat with integrated handles for additional support.MDS89740AXW height adjusts from 14" to 18" in one inch increments.MDS89745AXW height adjusts from 16.5" to 20.5" in one inch increments. Suction-cup feet secure bench in bathtub. Dual cross brace for extra stability with extremely durable welds. High-strength aluminum frame to prevent rusting. Aircraft rivets will not loosen. Completely assembled. Weights only 3 lbs.550 lb. weight capacity. Without Back. (Single)