Item Type: Flange Coupling Material: Stainless Steel Diameter: 56.8mm Width: 26.4mm Aperture: 12mm Suitable for connecting motor and wheel Package List 1 x Flange Coupling 1. Due to manual measurement, 1& 8209;3mm error is allowed, thank you 2. The picture may not reflect the actual color of the item due to differences between different monitors. 1Practical 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. 2Perfectly Machined: These couplings have clean, smooth edges and are perfectly machined to resist deformation under pressure. 3Premium Material: These bore rigid couplings are made of stainless steel material for impact resistance, strong durability and long service life. 4Fine Workmanship: Professional manufactured, exquisite workmanship with unique design, ensure stable performance and high reliability. 5Easy Installation: Easy to install without complicated tools or drilling, no modification is required, convenient for using, save your efforts.