Perfect Compatibility: The mixer coupler is a proven replacement for original parts and is compatible with KitchenAid models KSB52, KSB5, 5KSB52, and 5KSB5. Convenient Replacement: Replaces worn or damaged original couplers that may cause leaks or malfunction, restoring proper operation to your mixer. Premium Quality: Constructed from high-strength metal and wear-resistant rubber, this drive coupler is durable and long-lasting. Includes a high-quality key for improved performance. Specifications: Drive coupler diameter measures 3.6 cm (1.42 in), center hole is 0.6 cm (0.236 in), and key length is 11.2 cm (4.4 in). 100% Satisfaction: Customer satisfaction is our priority. If you receive a damaged item or incorrect quantity, please for prompt support and resolution.