Double Aluminium Suction Cup, Lifts 176 Lb Body is made of sturdy Aluminum & heavy duty rubber suction Cups Ideal for gripping / Lifting Glass and Flat Metal Sheets Each cup is 4 1/2" in Diameter [11.5 cm] Produces Reliable Strength With full contact with Smooth Flat surfaces Up to 176 lb, 80 kg lifting capacity with Full Suction contact