The Shimano EW-RS910 Handle Holder A & B is a versatile and essential accessory for cyclists looking to streamline their electronic shifting system. Weighing just 7 grams, this lightweight holder securely attaches the junction box to your handlebars, providing easy access for adjustments while riding. The EW-RS910 features a durable construction and a sleek design that seamlessly integrates with your bike's aesthetics. Compatible with Shimano's Di2 electronic shifting systems, this holder ensures a tidy and organized setup for your cables. With its compact size and reliable performance, the Shimano EW-RS910 Handle Holder A & B is a must-have for cyclists seeking convenience and efficiency in their gear setup.