Item Type: Flange Coupling_x000D_Material: Stainless Steel_x000D_Diameter: 56. 8mm_x000D_Width: 26. 4mm_x000D_Aperture: 12mm_x000D_Suitable for connecting motor and wheel 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.