No suction. We don't believe in suction grab bar at LiveWell. Suction puts folks at risk when it comes to Grab Bars which people rely on for safety. Our products have the LiveSafe Mounting System to install which includes the LiveSafe Flanges with a special hole pattern that allows you to get 3 screws securely into a stud. In addition, we include 2 FREE Hollow Wall Anchors in case studs are not available. See the attached installation video