Description: 【Strong Bearing Capacity】: The Bike Rear Rack Mount Adapters are made of thickened steel plate, offering strong bearing capacity. When you load a heavy suitcase on the rear rack, it holds the weight steadily. 【Universal Fit】: The Rear Rack Mount Adapters feature a U - shaped design with pre - drilled standard holes, fitting various bike models and rack structures. You can easily install them on different bikes. 【Easy Connection】: The Connectors are used for center - hole conversion, enabling a smooth connection between the rack and the frame holes. Connecting the rack becomes effortless. 【Enhanced Stability】: The Bike Parts enhance the overall stability of the rack, preventing it from shaking or loosening. Your equipment on the rack stays secure during the ride. 【Reliable Structure】: The Accessories have a well crafted structure, ensuring long term use. Whether for daily rides or long distance trips, they remain reliable. Specification: Material: Steel   Size Chart: 7.5cm x 1.3cm / 2.95 inch x 0.51 inch (Hole diameter 0.52cm / 0.20 inch, steel plate thickness 0.3cm / 0.12 inch) Package Includes: 5 Bike Rear Rack Mount Adapters Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.