7-speed Prepared for roller brake Shimano insert for rear hub. Type SG-C3001-7R Used on Shimano Nexus 7-speed rear hubs with roller brake The insert can only be used on: SG-7R40 - SG-7R41 - SG-7R42 - SG-7R43 - SG-7R44 - SG-7R45 - SG-7R46 - SG-7R50 - SG-C3001-7R 182 mm axle