External protection refers to the protection of machine tools' external parts, as opposed to the internal protection. The external protection of machine tools is designed to safeguard the exterior from dust and debris that may be introduced during high-speed operation, as workers pass by. With the protection of an external cover, the machine tool remains exceptionally clean, thereby extending its lifespan. Internal protection is for the protection of all fragile components within the machine tool, preventing injury to the operator during operation. It also allows for the provision of aesthetically pleasing, generous, high-taste, high-precision, and high-performance modern professional products. Mainly used for protective covers for engraving machines, precision engraving machines, bending machines, slitting machines, automated equipment, CNC machine tools, etc.