Bathtub Grab Bar provides support for the elderly, disabled and injured individuals to get in or out of bathtub Easily adjust rail height from 19 1/8' to 21 3/16' to fit people of different heights Solid metal construction with powder coating provides corrosion resistance, supporting individuals up to 330 Lbs Features a clamp with opening size ranging from 1 15/16' to 4 3/4' that can better fit your bathtub Turning locking mechanism allows the bathtub bar to be easily and firmly attached to tub wall