This Suction Grab Bar only works on tile size LARGER THAN 5x5", (2) The suction discs can not be mounted on grout seams. (3) Make sure there's no texture on the shower wall, (4) The mounting surface must be flat, non-porous, and smooth for any other applications. HOW TO INSTALL IN REMOVE THE MEDICAL KING NEW DESING SUCTION GRAB BAR 【Tool-Free Installation】 THE 3 SIMPLE STEPS HOW TO INSTALL 1- take a cloth and clean the flat surface 2 open the locks on the grab bar 3 push the shower handle to the wall a little strong 4 close the suction lock Suction Grab Bar PERFECT FOR ALL AGES grate for the elderly handicapped after surgery pregnant women or anyone who need just a little more support while showering grate for travel take it when you travel & easily install it in hotel rooms or guest bathrooms, take it with you everywhere