The item is a inflatable air wedge for car and home. They can be used for window, door and cabinet installations; replaces damaging pry bars and wooden shims. Very easy to inflate and deflate the shim. When you inflate the air shim, it stays pressurized. When you press the button near the air pump, it can release the air quickly. Features - Color: Black. - Material: Plastic - Size: About 16x15x1cm - Safely handles full size installations with just a single installer; saving time and labor costs. - Easy tools using simple squeeze pump and precise bleeder lets you raise and lower to perfect alignments. - Inflatable air wedge for window, door and cabinet installations; replaces damaging pry bars and wooden shims. - Powerful hand pump span gaps 2-80mm. - Easy tools using simple squeeze pump and precise bleeder lets you raise and lower to perfect alignments.