The StopTech 120.66044CRY Premium Cryo Treated Disc Brake Rotor (Rear) is the perfect addition to the brake system your 2001-2010 GM 2500HD or 2004-2010 GM 3500HD SRW . Symmetric vanes provides your rotor with proper heat transfer that prevents damage and wear. Mill balancing greatly reduces unwanted rotor vibration and ensures your rotor delivers smooth performance. This rotor features a cryogenic cooling process that extends the service life of the rotor while also being able to handle more extreme temperatures. This fully machined rotor has improved rotor balance to provide better pedal feel when braking.