E-Z Ancor® stud solver anchors install anywhere on a wall, even if you hit a wood stud behind the drywall. Piercing tip capable of penetrating wood to help ensure the ideal anchor spot. Install with only a #2 Phillips screwdriver (not included) and #7 x 1-1/4 in. screw (included). Stud Solver anchors are great for hanging bathroom/kitchen accessories, shelving, light fixtures, mirrors and picture frames.