Features 1、SIMPLE TO OPERATE: You need to hammer the removal tool to the damaged nut, and then choose a 1/2in square wrench to loosen the nut CCW, you can remove these rusty nuts 2、VARIOUS SPECIFICATIONS: The bolt extractor kit is available in four different sizes, including 17mm, 19mm, 21mm, 22mm, metric sizes and is widely compatible 3、WIDE APPLICATION: Whether for industrial repairs, car maintenance, or home decor, the nut bolt extractor kit can meet a variety of everyday needs 4、SOLID MATERIAL: Nut extractor set is made of high hardness Cr Mo steel material, and after black phosphating treatment to prevent oil and rust 5、WITH STORAGE BOX: All bolt and nut removers are placed in a single storage box for easy portability, you don't need to worry about losing, very convenient Specification Item Type: Bolt Extractor Kit Material: Cr Mo steel Size: 17mm, 19mm, 21mm, 22mm Extractor Inner Diameter: 1/2 Package List 4 x Extractor 1 x Accessory 1 x Storage Box