Premium Material - Aviation grade steel, anti-corrosion coating, can be used for a long time, never break. Doubly Safe - Compared to C-frame, the square design is more balanced and safer. Reinforced Thread - Using large size thread design, the thread is not easy to peel off during use, which is safer. Applicable Models - Fits for Dodge Ford Chevrolet GMC HD Torsion Bar Tool. Note - Torsion Key Tool can not be used with impact driver.