The Performance Tool W1007 8 inch Pump Vacuum Suction Cup is ideal for moving or lifting flat stones, tiles, slabs, glass, or any other item with a smooth flat surface. It features a durable, odorless, and strong rubber suction cup pad with an ergonomic grip. The vacuum holds for up to 6 hours, and a release lever ensures quick and complete release. Additionally, a red line vacuum loss warning indicator alerts you if the vacuum is failing. With a cup size of 20.32 cm (8 in.), it operates in temperatures ranging from -20C to 60C (-4F to 140F). The maximum lifting capacity is 99.8 kg (220 lbs.) horizontally and 81.7 kg (180 lbs.) vertically.