Multi Size: This spring kit including extension springs and compression springs, a total of 20 different sizes, 200 piece. Spring assortment of different size will meet you different demands Material: The extension springs is made of high quality spring steel, which is stable, reliable, smooth, rustproof, high ductility, good fatigue resistance, and studry for long time use Convenient to Carry: Mechanical compression springs kit with a plastic storage box, the springs are neatly packed in a clean box, storage and carrying are more convenient Easy to Find: Assorted compartment is convenient for you to store and find the desired size. Transparent box storage effectively improves the efficiency of searching size Scope of Application: An essential hardware for various repair and maintenance in vehicle, electric equipment appliance, digital devices, other measuring equipment, etc, Weight: 0.7936641432 Pounds, Manufacturer: Nikou