Material: This wheel socket set is made of molybdenum steel, providing high protective strength and a long service life.Storage Box Included: Our Thin Socket Set comes with a storage box for easy transportation, quick organization, and storage. It also helps you identify and use it easily.Wide Application: This socket spanner set is suitable for most cars, will not cause scratches, and is durable.PROTECTION: The Socket Wrench Set helps protect the outside of the wheel lug nuts from scratches.Accessories: Protective Wheel Impact Socket Set Anti scratch tool set, designed with bright colors and clear markings, is convenient and practical, and is an ideal car accessory. Specification: Material:Chromolybdenum steel Size Chart: 9.8cm/3.86inch Package Includes: 1 piece 17mm, 1 piece 19mm, 1 piece 21mm, 1 box Note: Please allow slightly errors due to manual measurement and different monitors.