VEVOR flex shaft speed controller power supply unit, commonly used for jewelry polishing machines, rotary tools, grinders, and flex shaft motors. This control box allows users to adjust motor speed easily with the front dial for precise operation during polishing, grinding, engraving, or crafting work. Built with a durable metal housing and digital display, this unit is designed for reliability in jewelry workshops, hobby workspaces, and small tool benches. Features: • Brand: VEVOR • Adjustable speed control dial • Digital display screen • Heavy-duty metal housing • Front connection port for motor attachment • Ideal for jewelry polishing machines, flex shaft tools, engraving tools, and grinders Condition: Pre-owned condition. Shows normal cosmetic wear from use. Please review photos carefully for full condition details. Great replacement or backup control unit for jewelry polishing machines, rotary tool systems, or flex shaft motors.