The Box One 31.8 shifter clamp is an accessory that converts any Box shifter to be compatible with modern drop-handlebars found on gravel, cyclocross, and commuter bikesHinged clamp design is easy to install without having to remove grips or tapeCompatible with all Box shifters as well as some other brands31.8mm clamp only, shifter or brake not includedShifter ClampBlkUPC/EAN/GTIN: 639266097549