Compatible with chain drive chamberlain sears craftsman manufactured operators 1984-currentKit Includes: Gear and sprocket, worm gear, grease, motor shaft bearings, sprocket bearingsCompatible with chamberlain, sears, craftsman and lift master 1/3 and 1/2 HP chain drive modelsEasy DIY- complete assembly Replacement for Liftmaster 41c4220a Gear and Sprocket Kit Work with Chamberlain Sears Craftsman Chain Drive ModelsWhen shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specificationsWe want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don''''t hesitate to contact us. We are here to help and will do our best to assist you.Thank you for choosing our product. We hope you enjoy it