Feature: 1. Practical Function: The hub is fixed and fixed to the motor shaft with a coupling. When you attach this stainless steel hub to the wheel, it will meet your requirements exactly. 2. Perfectly Machined: These couplings have clean, smooth edges and are perfectly machined to resist deformation under pressure. 3. Premium Material: These bore rigid couplings are made of stainless steel material for impact resistance, strong durability and long service life. 4. Fine Workmanship: Professional manufactured, exquisite workmanship with unique design, ensure stable performance and high reliability. 5. Easy Installation: Easy to install without complicated tools or drilling, no modification is required, convenient for using, save your efforts. Specification: Item Type: Flange CouplingMaterial: Stainless SteelDiameter: 56.8mm Width: 26.4mm Aperture: 12mm Suitable for connecting motor and wheel. Package List: 1 x Flange Coupling Note: 1. Due to manual measurement, 1‑3mm error is allowed, thank you!2. The picture may not reflect the actual color of the item due to differences between different monitors.