Quality Craftsmanship: These wheelchair accessory bearings feature smooth edges with no burrs, ensuring fine workmanship. They are designed to operate quietly with high rotation speeds and minimal noiseSturdy and Heat Resistant: Built to withstand high loads without overheating, these bearings are suitable for most wheelchair installations, providing reliable performance under various conditionsSilent Operate: The bearings incorporate a low noise design that offers high speed operate with low friction and fine wear resistance, enhancing the overall user experienceSteel Material: Constructed from steel material, these bearings ensure long last use and sturdy performance in demanding environmentsGreat Fit Dimensions: With an axle hole diameter of 12.7mm, an outer edge size of 31mm, and an inner edge size of 26mm, these bearings for optimal compatibility with your wheelchair components. Each package includes two bearings for your convenienceSize Chart:shaft hole diameter: 1.27cm/0.50inchouter edge: 3.1cm/1.22inchinner edge: 2.6cm/1.02inchPackage Includes:2Wheelchair Fork BearingsNote:Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.