BINO SMARTSUCTION Chrome Double Robe Hook SMARTSUCTION technology combined with natural rubber allows for a powerful, long lasting adhesion to most surfaces No tools required and no damage left behind by installation, great for renters Simply position on a smooth and clean surface, apply pressure and turn clockwise Measures 3.5" x 2" x 4.25" Clean both the wall and the base of the suction cup with water or rubbing alcohol. Make sure the cap and base of the suction cup are completely loosened before applying to wall. Apply pressure to the base of the suction cup and tighten the cap to secure, as shown in the included instructions.