The Dual Tub Grip Has An Integrated Adjustable Locking Mechanism That Attaches Easily To Most Bathtub Walls From 3 To 5-1/4 Thick * Simple Clamp Means No Difficult Twisting Motion During Installation * Two Textured Grab Areas At Different Heights For Maximum Security And Flexibility When Entering Or Exiting The Tub * No Tools Required * Tested To Withstand Up To 350 Lbs. *