The M5-N5ST-Z100 is a miniature rotary tool set from the Duratool company. It consists of 5 small collets and bits for sanding, drilling, polishing, and engraving on a variety of materials. The small size of the set makes it perfect for intricate and detailed applications, such as jewelry engraving, watch repair, and model building. The ergonomic design and comfortable grip of the pen-style handle make the process easy and efficient, while the rotary speed control and adjustable torque settings give you total control over the job you’re working on. The set is lightweight and durable, ensuring it can stand the test of time.