2 Pack Universal Bathtub Grab Bar provide strong support for the elderly, disabled & injured people Adjustable rail height from 19 1/8' to 21 3/16' to accommodate people of different heights Sturdy metal construction with powder coating for corrosion resistance Features a clamp with opening size ranging from 1 15/16' to 4 3/4' to perfectly fit different bathtubs Tool-free Installation with clamping knob allows you to attach the bar to the tub wall easily and firmly, no drilling required