Heavy duty suction cups ruler handle for quilting patchwork, it is made of industrial plastic and thick rubber with super suction power for long service life. The suction cup is a great tool to be used to stick on any smooth flat non-porous dry surface, such as glass, plastic, window, doors, etc. Easy to use – Put the suction cup on the screen and presses the TAB, rubber and the screen get together nicely then pull the TAB. Super suction makes strong power, the sucker is with 12 kilogram lifting capacity. It is a must have tool for quilting, sewing, and crafting projects.