1 derailleur including, bolt per package. Compatible with the following models: 1156932 - Energy Touring HD 19 Uni 1172345, 1157401 - Energy Touring Hd 20 Uni 1143950 - Energy Boost HD BFmax center 18 Uni 1156935 - Energy Boost HD BFmax center 19 Uni 1132497 - Xc-E 275 Cliff 17 1143949 - Energy Boost HD BFmax center 18 Lady 1143951 - Xc-E Trainer 275 BFmod center 18 1156911 - Xc-E Trainer 275 BF modest center 19 1156934 - Energy Boost HD BFmax center 19 Lady 1143946 - Energy Touring HD 18 Lady 1156931 - Energy Touring HD 19 Lady 1132490 - Energy Flash Lady 17 1132491 - Energy Flash Uni 17 1132492 - Energy Spike Uni 17 1132493 - Energy Boost (Baif Center) Lady 17 1132494 - Energy Boost (Baif Center) Uni 17 1132496 - Xc-E 275 Hill 17 1143947 - Energy Touring HD 18 Uni 1172342 1172287 - Xc-e Trainer 275 Bf Modest Center 20 1172346,1172348 - Energy Boost Hd Bfmax Center 20 Uni 1132495 - Energy Blaster (Steps) Uni 17 1143952 - Xc-E Pro 275 Steps 8000 18 1156912 1157677 - Xc-E Comp 275 ST