Door Mounting Cart Set - Adjustable fit for many door types: height and width are adjustable to accommodate a wide range of doors, including French doors, pocket doors, bi-fold doors, steel frame doors, fire doors, barn doors, and heavy-duty doors. Note: the kit lowers the door to 11/32 in and lifts it to 1-3/8 in. - Easy one person installation: designed for simple use and enables hands-free door installation. Equipped with four 360-degree swivel wheels with brakes to simplify moving and positioning the door during installation. - Stable and reliable design: features triangular bracing on all four corners to improve structural integrity and load capacity. Each mounting tool is rigorously tested to withstand up to 227 kg, with a combined capacity of 453.6 kg. Superior welding ensures edges and corners are smooth and safe to handle. - One person operation: unlike traditional methods that require multiple people, this door mounting cart allows effortless adjustment by a single person, making the process straightforward and efficient. The set is ready to use immediately with no additional accessories required. Use scenarios - Home renovation or door replacement: hang or reposition heavy interior doors with one operator, achieving precise alignment without extra help. - Exterior or heavy-duty door projects: install or adjust barn, steel frame, or other heavy doors at residential or light commercial sites where space and manpower are limited. - Small-space or workshop applications: install or realign specialty doors in tight areas such as apartments, studios, or garages, where single-operator setup is advantageous.