The Flexible Shaft Model 103 is a versatile transmission tool with a shaft diameter of 6mm and a total length of 1m. It supports various collet sizes and is suitable for grinding and polishing operations at a rotational speed of 1,200 to 3,600 rpm. **Allowable rotational speed is 1,200 to 3,600 revolutions per minute (rpm)**, and it can be used for tasks such as grinding and polishing. Three types of collets are included, with chuck capacities of φ2.8-3.2mm, φ3.8-4.2mm, and φ5.8-6.2mm, allowing for the attachment of various bits and tools. The inner shaft is made of high-carbon steel wire wound in multiple layers to ensure strength and durability. The handpiece is a front-and-back sliding type, easy to grip, and designed to reduce fatigue during long hours of work. Applications include freeing oneself from the weight of power tools to facilitate detailed work and improving the efficiency of grinding and polishing operations.