CMXZDCG4910 10 ft Belt Rail Extension Kit Buy Now CMXZDCG4910 10 ft Belt Rail Extension Kit Buy Now The 10 ft. Belt Rail Extension Kit is used to complete garage door opener installations on belt drive garages with up to 10 ft. garage doors. Add to Wishlist Features LENGTH EXTENSION: Allows your belt drive garage door to handle up to 10 ft. doors Includes (1) CMXZDCG4910 Steel Rail Extension with Replacement Belt (1) Set of Required Hardware Support No Limited Warranty Unfortunately, this specific product is not eligible for any warranty. Whilst this product is not eligible, further information about our warranties can be located below. Learn More Service We take extensive measures to ensure all our products are made to the very highest standards and meet all relevant regulations. Learn More Manuals CRAFTSMAN manuals are available to help put your tools in operation.