Description: 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 noise Sturdy and Heat Resistant: Built to withstand high loads without overheating, these bearings are suitable for most wheelchair installations, providing reliable performance under various conditions Silent Operate: The bearings incorporate a low noise design that offers high speed operate with low friction and fine wear resistance, enhancing the overall user experience Steel Material: Constructed from steel material, these bearings ensure long last use and sturdy performance in demanding environments Great 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 convenience Size Chart: shaft hole diameter: 1.27cm/0.50inch outer edge: 3.1cm/1.22inch inner edge: 2.6cm/1.02inch Package Includes: 2Wheelchair Fork Bearings Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.