Stainless Steel Material: Made of high quality 304 stainless steel, rust and corrosion resistant, widely used in industry. Storage Case: This set is organized by size in a transparent storage case for quick access and optimal protection. Assortment Set: There are 14 different sizes in one set to meet your different needs. Hex Heads: Moderate and clear hexagon socket heads can make your work easier. Application: Ideal for use by a wide range of workers and repairers, from plumbers to fitters, both professionals and amateurs, even DIYers can choose to use.