Make of durability ABS , this knob switches features enhanced suction supporting up to16.5lbs (7.5 kg), outperforming traditional suction cups. Easily install and remove within seconds. Simply the surfaces, press the switches, and secure firmly—no drilling or adhesives required. Integrated vacuum locking rings actively maintains seal pressure, air release for a slip grip even under tension. Avoid twisting or prying the handle. Rotating the marked rings clockwise to "" or counterclockwise to "unlock" for secure operations. Ideal for adding instants pull handles to glass shower door, tiles, acrylic panels, and finished wood surfaces—perfect for drawers, cabinets, or as temporary hooks.