The Performance Tool M696 Air Hammer Retainer Spring is the perfect replacement for your worn-out or damaged retainer springs. Designed as a 2-piece set, these retainer springs are specifically compatible with Performance Tool items M550DB and M668, ensuring a seamless fit and optimal performance. Made from high-quality materials, these replacement springs are durable and can withstand the rigors of heavy-duty use. With these replacement retainer springs, you can improve the efficiency of your air hammer and achieve better results in less time. Additionally, their easy-to-follow instructions and simple design make installing these replacement retainer springs a breeze, allowing you to get your air hammer back up and running in no time.