AquaChase 17“ Suction Shower Grab Bar with Indicators, Tool-Free Installation, Steady Handle for Balance Assist for Bathtub, Toilet, Bathroom, Dual Tone, Silver/Gray 2-PackBrand: AquaChase Color: Gray Features: GREAT FEATURE OF INDICATORS The indicators of the suction cup change from red to green when a safe and secure hold is achieved. If a red sign showes up, do not use it and reattachment is needed. IMPORTANT NOTE Flat, smooth, non porous wall surface is required in any applications, such as glass, glazed tile, acrylic, fiber glass shower. This suction shower handle only works on tile size No Smaller than 4x4. Make