Promax Brake Post Extender Description: The Promax Brake Post Extender provides an additional 16mm of brake arm adjustment. CNC-machined from 6061-T6 aluminum, BE-1 extenders easily mount to any frame's existing cantilever brake bosses. Features: Provides an additional 16mm of brake arm positioning CNC-machined from 6061-T6 aluminum All necessary hardware is included Specifications: Bolt Size: M10 Weight: 1.15 oz (32g) Including hardware