TOOLCRAFT expansion sleeves made of spring steel according to DIN 1481 standard, designed with a heavy-duty construction for demanding mechanical applications. These expansion sleeves measure 25 mm in diameter and 85 mm in length, providing secure fastening in bicycle headset assemblies as well as other precise mechanical connections. The spring steel construction ensures high tensile strength and reliable performance under vibration and load conditions. Each pack contains 10 identical expansion sleeves for multiple installations or replacements. These components are designed for professional bicycle maintenance and repair applications, particularly in headset bearing systems where precise fit and durable fastening are crucial. The heavy-duty design offers increased load capacity compared to standard versions, making them suitable for high-stress applications in bicycle components and other mechanical assemblies that require secure expansion fastening. The standardized dimensions ensure compatibility with industry specifications and easy replacement in existing systems. Made from high-quality spring steel, these expansion sleeves maintain their clamping force over extended periods and resist deformation under typical operating conditions in bicycle headset applications. The robust construction with spring steel properties ensures long-lasting performance and reliability in professional environments where precise mechanical connections and long-term durability are paramount.