Hello GuitarRick and thank you for the feedback you posted on the Home Depot website. The Moen SecureMount 3.17 in. Stainless Steel Grab Bar Anchors in Chrome (2-Pack) allows for easy grab bar installation with no studs required. The Moen SecureMount 3.17 in. Stainless Steel Grab Bar Anchors in Chrome (2-Pack) requires a 3-1/2” space behind the wall for installation and provides up to 300 lbs in weight bearing capacity when securely installed. Using Moen’s Securemount Anchor system, Moen Securemount Grab Bars can be mounted onto a variety of substrates. These include ½” drywall, ½” drywall with tile, ½” drywall with marble, 5/8” drywall, 5/8” drywall with tile, 5/8” drywall with marble, 1/8” fiberglass tub surround and ¼” fiberglass tub surround. Our product specialists are available for pre-purchase, installation and warranty assistance. They can be reached at 1-800-289-6636 and are available Monday through Friday from 8:00 am – 7:00 pm Eastern Time.