Large and Strong: 7” diameter cup with a 90-pound lifting capacity for heavy-duty tasks. Durable Construction: Handles made from cast aluminum, secured with high tensile strength bolts for durability. Visible Safety Indicator: Features a highly visible pump vacuum ring; red line disappears when vacuum seal is secure and reappears to warn of pressure loss. Specialized Design: Specifically engineered for curved glass, offering optimal performance where flat glass vacuums fall short.