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.2Machined: These couplings have clean, smooth edges and are machined to resist deformation under pressure.3Material: 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.1 x Flange Coupling