Rear Derailleur Dropout Hanger Diamondback RMM220
Replaceable alloy rear derailleur mech hanger will fit various Claud Butler/Raleigh/Diamonddback/Cayusa/RSP150/200/250/500 bikes, plus lots of other makes.
This particular hanger is commonly referred to as an "RMM220" hanger.
These hangers are specifically designed to break to prevent damage to your frame.
Unfortunately it is not always possible to stipulate which models these hangers will fit, as manufacturers tend to change frame designs frequently. The best way to match your hanger is to compare it with the one pictured.
Popular models this hanger is compatible with:
Diamondback V-Link Pro (1996)
Diamondback Vertex (1995)
Diamondback Zetec (1996)