Toolcraft TO-411174 expansion pins are precisely engineered fastening components for model building and technical applications. These expansion pins measure 20 mm in diameter and 120 mm in length, and are made from high-quality spring steel, providing excellent durability and reliable performance. The set includes 10 identical pins, making it suitable for multiple projects or as replacements. The spring steel construction ensures consistent expansion force and resistance to deformation under load, allowing for secure fastening in various materials. These expansion pins are particularly useful in model building applications where precise alignment and secure assembly are critical. The standardized dimensions ensure compatibility with common model building components and technical assemblies. The material properties of spring steel offer good corrosion resistance and mechanical strength, ensuring long-term reliability in demanding environments. Each pin features a smooth surface finish that facilitates easy insertion while maintaining a secure holding force. The consistent manufacturing quality guarantees uniform performance across all pins in the set. These expansion pins are suitable for use in hobby modeling, prototype development, and light industrial applications that require reliable mechanical fastening solutions. The product is supplied as individual components without additional accessories, allowing for flexible use according to specific project requirements. The robust construction and precise dimensions make these expansion pins a practical choice for technical enthusiasts and professional model builders who rely on dependable fastening solutions.