TOOLCRAFT expansion pins, made from spring steel according to DIN 1481 standards, are designed for high-performance applications in bicycle headsets. These precision pins have a diameter of 21 mm and a length of 85 mm, ensuring a secure attachment of headset bearings and components. The high-quality spring steel construction provides exceptional durability and resistance to deformation under load. The high-performance design guarantees reliable performance under demanding riding conditions while maintaining the correct alignment and stability of the headset components. Each pack contains 10 identical pins for multiple installations or replacements. The standardized dimensions ensure compatibility with bicycle headset systems that require 21 mm expansion pins. These components are essential for maintaining proper steering function and bearing alignment in bicycle headsets, contributing to overall riding safety and performance. The spring steel construction offers consistent expansion properties for secure attachment without damaging the component surfaces. Suitable for professional bicycle maintenance and repair applications where precise fit and reliable fastening are required. The standardized manufacturing ensures consistent quality and dimensional accuracy of all pins in the set.