1 inch hub to 6 holes; in the handlebar up to 3 holes; in Adapter set head black 1. Brand new and high quality steel wheel hub. 2. Quick release allows the handlebars to be removed quickly. 3. High quality aluminum structure, corrosion-resistant, sturdy and durable. 4. Comes with mounting screws, fits the handlebar perfectly. 5. Fits 6 holes; The handlebars measured 2.75 inches (70mm), 1.375 inches (35mm) or 75mm from the center to each of the 6 holes. Specification: Features: Brand new and high quality steel wheel hub. Quick release allows the handlebars to be removed quickly. High quality aluminum construction, corrosion-resistant, sturdy and durable. Comes with mounting screws, fits the handlebar perfectly. Fits 6 handlebars holes; measured at 2.75 inches (70mm), 1.375 inches (35mm), or 75mm from center to each of the 6 holes. Specification: Condition: Brand New Item Type: Steering Wheel Hub Adapter Materia