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.