1. Quality Door Installation Kit: The door panel lifter is made of robust steel as the raw material, which is stable and sturdy enough to withstand impacts and bending. At the same time, the surface features a black powder coating, making it not only resistant to corrosion and rust but also aesthetically pleasing and textured. This matte treatment significantly extends its lifespan. 2. **Stronger and Thoughtful Design**: The four corners of our door installation kit are reinforced with a triangular design, making it resistant to deformation and enhancing its loadbearing capacity. After extensive testing, each installation tool can support 227 kg (a total of 453.6 kg). Additionally, we use welding techniques, ensuring that its edges and corners do not cut the skin during use. 3. **Fits 3.5 cm and 5.4 cm Doors**: The door installation kit is designed for various doors with thicknesses ranging from 3.5 cm to 5.4 cm. You can easily adjust the correct thickness to match the door with a simple knob. The tool is equipped with a large nonslip mat area, effectively protecting the door from damage. The part that contacts the door also features a nonslip mat to increase the force area for higher efficiency. 4. **Hands Easy to Use**: Normally, at least two people are required to install a door. However, this door installation kit allows for hands operation, enabling a single person to move and position the door effortlessly. The door lifter comes with four 360° swivel wheels with brakes, making it easy to move and stop during installation.