1、[Multipurpose] Air pump can be used as a pry bar or lever for the installation of doors, window and cabinets. It can also be used as a car unlocking tool or for car repairs. 2、[Reusable] Air alignment pump does not leave any marks on its surroundings. The pad is also reinforced by fibres, making it durable for use time and time again. 3、[Large Load Bearing Capacity] Each air shim can lift up to 200kg/440.9lb, a total of 4 are included. Used together, the 4 air shim can lift up to 800kg/1763lb for greater stability and safety. 4、[Easy To Use] The inflatable air alignment cushion, when fully deflated, is only 0.06in thick, which makes it easier to install into door space and installers toolkits. 5、[Labor Saving] With this air alignment pump, only one installer is needed to safely handle a full size installation. Effectively saving you installation time and labor. 4 x Air Alignment Pump Item Type: Air Alignment PumpMaterial: Composite FibreAir Cushion Size: Approx. 16 x 16cm / 6.3 x 6.3inColor: WhiteWeight: Approx. 315g/ 11.1ozProduct Features: Strong anti pressure and load bearing capacity, a single product can withstand a weight pressure of 200kg/ 440.9lb or more. It can lift objects up to 9CM/ 3.5in when full of air. It can be used repeatedly.(It can be used many times. (At least 2 of them should be used for glass installation, if you are installing other home furnishings, the number will be more)