Derailleur hangers are designed to break so your pricey derailleur won't. It only takes a split second for a branch or debris to ruin an otherwise epic ride, so don't end it early. Carry an extra hanger in your pack. If you have a Heckler 5.0, this dropout kit is what you need. The kit includes: one black anodized derailleur hanger, two mounting bolts, two mounting nuts, and two adjustment pins.