Having an extra derailleur hanger with you when disaster strikes sure beats walking your bike out. We strongly suggest buying one in advance. If your steed is a Santa Cruz Blur LT2, Heckler 5.0, Chamelon 4.0, or Nomad 2.0, this is the one for you. Plus, it doubles as a bottle opener, so it's extra handy. In the package, you'll receive one black anodized derailleur hanger and two mounting bolts.