1Reliable Alternative: This feed return coil spring is a great alternative to many existing sleeve springs on drill presses, a chrome plated spring that returns the sleeve to the top after drilling is complete. 2Wide Application: The feed return coil spring is used for various vacuum cleaner coil springs, volumetric tube coil springs and seat belt coil springs. 3Highly Adaptable: This feed return coil spring is ideally suited to bench drilling and can be used for both horizontal and vertical types of bench drilling. 4Stable Performance: The feed return coil spring is made of reliable spring steel, with stable process performance, strong adaptability and high elasticity reduction resistance. 5Antirust: The feed return coil spring is chemically blackened to form an oxide film, which insulates the air and acts as an antirust.