That’s an INGCO 50kg Vacuum Suction Cup Lifter - aka a "glass sucker" or "tile lifter".
What it’s used for:
It sticks to smooth, flat surfaces using suction so you can lift/move heavy stuff without it slipping.
Main uses:
1. Glass - Lifting, carrying, and installing windows, glass doors, tabletops, mirrors. Glaziers use these daily.
2. Tiles & marble - Moving big floor tiles, granite, ceramic, or porcelain slabs without breaking them or your back.
3. Sheet metal/acrylic - Any smooth non-porous surface where you need a solid grip.