The Carex round shower and tub stool is ideal for narrow tubs and other places where a regular chair won't fit. The shower stool features slip resistant rubber tips to grip the tub floor and has adjustable aluminum legs to provide a secure and stable base. The seat measures 13” in diameter. The outside diameter at the bottom of the legs is a little bit wider at 14-7/16”. The stool is 15.5” high at its lowest level; you can raise it up to another 5”, in one inch increments, to 20.5” high.