CRL Wood's Powr-Grip® Vacuum Cups with Handi-Grip™ handles are designed to easily lift and position a wide variety of items including windshields, stone tiles, and sheet materials. They are available in styles for gripping smooth, curved, or flat non-porous surfaces. The red-line indicator warns the user of any vacuum loss, and a check valve allows re-pumping without loss of the remaining vacuum. Lift tabs on the pad edges permit instant release. Each Cup comes with a vacuum pad protector.