High quality 304 stainless steel: It is reliable and rigid strength as corrosion resistant quality.This type of steel can withstand drastic changes in weather and temperatures, including placement in extremely humid areas.These qualities ensure that these screws and nuts are made virtually indestructible.Wide usage range and purpose: from furniture and plumbing repair to woodwork and other DIY projects.Ideal for use by a variety of plumber assembly workers and repairs both professional and amateur, even DIY users can choose to use it.Variety size and good storage: 520 pcs.Different sizes of m3 m4 m5 screws with matching nuts, totally 12 type models.One purchase Bolts and nut kit assortment meet your multiple needs.Bonus 3 hex wrench sizes.All screws, nuts and hex wrenches are placed in the transparent plastic storage box, convenient for collection and use.Environmentally friendly: the bolts and nuts are made of high-quality stainless steel and the storage box is non-toxic plastic.Not only because it is made from high-quality materials, but this set is also mercury- and plus-tolyce-free, making it sticky.About us: has been specializing in designing and manufacturing fantastic tools tools for years.Long-term production experience ensures that each product from raw material selection to processing technology is the best in the industry.If you encounter any problems with the product and installation, please do not hesitate to contact us.