Qadira Strengthen type Movable Aluminum Suction Cup Plate Double Handle Professional Glass Puller/Lifter/Gripper Maximum lifting Load capacity 210 Pounds in level, load capacity 170 Pounds in vertical Strengthen type suction cup made with durable aluminuim body and heavy duty plastic handle The movable suction cup is specially designed for the radian glass surface. Great for auto windshield ,fish tank, and any clean non-porous surface. Must be mounted on a clean, smooth, flat surface. Use it with caution.