Large Capacity and Efficient Application: This drywall flat finishing box features a deeper hopper design that holds more plasterboard putty, reducing interruptions from frequent refills and covering a larger wall area in a single application, significantly improving work efficiency. Adjustable Extension Handle: The drywall flat finishing box includes an adjustable extension handle with a length that can be easily adjusted with a simple press, allowing users to reach ceilings and high walls without ladders or scaffolding for safer and more convenient application. 360° Flexible Rotating Head: The putty box head supports 360° adjustment, finely tuned to any angle using a precision knob, enabling even and smooth putty application on walls, ceilings, or corners to adapt to various complex environments. Dual-Spring Uniform Discharge System: This finishing mud box features a built-in dual-spring pressure system that ensures putty is discharged evenly at a constant speed, preventing interruptions or accumulation, with a spring pressure plate that smooths uneven wall areas efficiently. High-Quality, Durable Aluminum: Made from a hard aluminum alloy shell, this drywall taping tool is lightweight yet robust, extending its lifespan and making it suitable for professional putty workers, decorators, and DIY enthusiasts handling joint treatments and surface finishing.