To Make Life Easier by Our Products! Introduction: Complete kit includes: Helical gear and top hat assembly, worm gear, wear bushings, grease, and hardware needed to replace the chain drive gears. Our Chain Drive Gear and Sprocket Kit is a complete chain drive gear and sprocket replacement kit. This gear and sprocket assembly is compatible with various chain drive garage door openers; manufactured after 1993. Replacement parts for chamberlain, sears, craftsman and lift master 1/3 and 1/2 HP chain drive models. Return: Returns are accepted . In case of a refund all items must be returned undamaged, in a re-sellable condition. For DOA (Defective On Arrival) items, which will be replaced or refunded, please inform us within 24 hours of arrival, please also keep all of the components and original packaging as further checking might be required. Faulty items must be returned for repair or exchange. Buyer is responsible for all shipping costs of returning an item for a refund or exchange. Delivery: All products are individually inspected before being dispatched, to ensure items are sent out in perfect condition. Items will be shipped within 48 hours after payment is received / cleared (except weekends and holidays). Feedback: 1.We are committed to your satisfaction. Your positive feedback and 5 stars rating will be highly appreciated. 2.If you are not satisfied by any means, please give us an opportunity to offer you a proper solution. Thanks! Contact us: 1.If you have any question, Please contact us.All message will be answered within 24 hours from Monday to Saturday. 2. Please contact us before leaving any negative or neutral feedback or opening disputes, we will work with you to solve any problems.