Perfect Compatibility: The mixer coupler is proven to be a perfect replacement for the original parts and is compatible with KitchenAid models KSB52, KSB5, 5KSB52, and 5KSB5. Convenient Replacement: The original mixer coupler may wear out or break after long-term use, causing leaks or malfunction. This replacement coupler helps restore proper mixer function. Premium Quality: Constructed from high-strength metal and wear-resistant rubber, the blender coupler is durable and tested for long-lasting performance. A high-quality key design enhances operational efficiency. Specifications: The drive coupler has a diameter of 3.6 cm (1.42 in), a center hole of 0.6 cm (0.236 in), and a key length of 11.2 cm (4.4 in). 100% Satisfaction: If you encounter any issues with the product upon arrival, such as damage or incorrect quantity, please for assistance. We are committed to providing prompt and satisfactory support.