Check the listing for details. Door Moving Fixing Holder Tool Installation Auxiliary Rotating Wheels with Brake. Color: Silver, Condition: New. Listed at 80.28 USD. How to Use Place the door panel into the tool groove, and adjust the screw rods on the side of the tool to secure the door panel. Rotate the black knobs on both sides clockwise to adjust the height and move the door panel to the installation position. After turning the black knobs counterclockwise to adjust the door panel to the desired height, the tool can be secured with wheel brakes and is ready for installation. Application It is mainly applied in installing doors and is suitable for bifold doors, steel frame doors, fire-rated doors, barn doors, and more with a thickness of 1.375 to 2.25 inches. This tool kit is ideal for both home DIY projects and professional use. Package Included 2* Door Installation Tools 1* English Diagram.