TOOLCRAFT expansion pins made of high-quality spring steel provide reliable fastening solutions for bicycle headsets and other mechanical applications. These pins, compliant with DIN1481 standards, feature a robust construction with dimensions of 20 mm in diameter and 65 mm in length, ensuring secure connections in demanding bicycle environments. The spring steel material offers excellent durability and resistance to deformation under load, maintaining consistent performance over extended use. Each pin is precision-engineered to ensure uniform expansion properties and create stable connections in headset bearing systems and frame joints. The 25-piece set provides an ample quantity for multiple installations or maintenance needs. These expansion pins are designed for compatibility with standard bicycle headset systems and can be used in various outdoor recreational equipment where reliable mechanical fastening is essential. The corrosion-resistant spring steel construction ensures long-term performance in various weather conditions encountered during cycling activities. Proper installation creates a secure mechanical connection without the need for additional adhesives or specialized tools. The standardized dimensions guarantee compatibility with industry-standard bicycle components and spare parts. These expansion pins represent a practical solution for bicycle maintenance professionals and enthusiasts seeking reliable fastening components for headset bearing systems and structural connections in bicycle equipment.