SRAM NX Eagle Trigger Shifter & Rear Derailleur, 12 Speed, BlackThe NX Eagle trigger shifter means on demand gear selection throughout the entire wide range Eagle cassette. The massive range means you never have to worry about having the right gear for the terrain. NX Eagle means easy, intuitive shifting every time for every rider. Compatible with Matchmaker X clamp Designed to be used with Eagle 12 speed derailleurs Eagle Technology creates a smoother and more precise shifting system with exceptional reliability