Perfect Compatibility: The mixer coupler is proven to be a perfect replacement for the original parts and well compatible with Kitchen Aids KSB52, KSB5, 5KSB52, and 5KSB5. Convenient Replacement: The original mixer coupler may wear out or break after long-term use, causing the mixer to leak or malfunction. This replacement clutch helps restore proper bl operation. Premium Quality: Made of high-strength metal and wear-resistant rubber, the bl clutch is durable and long-lasting. The high-quality key improves working efficiency. Specifications: The diameter of the mixer drive coupler 9704230 is 3.6 cm (1.42 in), the center hole is 0.6 cm (0.236 in), and the key length is 11.2 cm (4.4 in). 100% Satisfaction: If you encounter any issues with the product upon arrival, please contact the seller. The seller will strive to provide satisfactory after-sales service.