A Manual Ring Sizing Machine is a tool used in the jewelry industry to adjust the size of rings. The machine is operated by hand, typically using a lever or handle to apply pressure and resize the ring. These are equipped with ring mandrels, which are tapered rods used to stretch or compress the metal of the ring to achieve the desired size. This type of machine is operated by hand, allowing jewelers to resize rings for customers based on their specific requirements. Manual Ring Sizing Machine is commonly used in jewelry repair and customization services.