1Unique Design for Door and Window Installation: This air shim is specifically engineered to adjust and install doors and windows, making your installation work easier and more efficient.2Extensive Applications: Not only for door and window installation, but it can also be used in auto repair works. A versatile tool in your toolbox indeed.3Enhance Durability with Integral Pressing: The air shim and the air pipe are integrally pressed together to diminish air leakage and enhance durability, promising a long lasting working life.4Accurate Control: Simple squeeze pump and exact bleeder valve designs enable you to carry out perfect alignments by raising and lowering the tool effortlessly.5Adjustable and Thickened Design: The air shim can be adjusted according to your working needs, and its thickened design ensures a stable and secured support during usage.