Equalizer Auto Glass Visual Vacuum Plunger Cups REINFORCED HANDLES- The handles are made of cast aluminum and are attached to the cup by high tensile strength bolts. GREAT FOR WINDSHEILDS- these vacuum cups have the ability to attach to windshields and lift them off without any hassle. PICK-UP CURVED GLASS- Unlike many vacuums these are made for curved glass. 90 POUND CAPACITY- The Equalizer Windshield Setting Cups are big: at 7" in diameter and each vacuum cup is rated at 90 pounds of lifting capacity. VISIBLE PUMP RING- As you pump the plunger to create the vacuum seal the red line disappears and, it warns you that it is losing pressure when it reappears.