This little goodie allows you to mount any SRAM underbar trigger shifter to a 31.8 dropbar. Why do you need this? Doesn't SRAM make their own road shifter? Well, yes they do. But none of them are compatible with the awesome 10-42t spread found on their mountain 1x drivetrains. - 6061 Aluminum - Fits 31.8mm handlebars - Compatible with SRAM MTB RH shifters (not included).