1、Kit Contents: This kit contains various screws, nuts and spacers for M2, M3, M4 and M5, and comes with a hex wrench and storage box. 2、No Deformation: Tight and uniform threads are less likely to deform and slide during rolling and installation, allowing you to work more smoothly and improve efficiency. 3、Clear Threads: Accurate design provides maximum tightness. Standard production, slick appearance, clear threads, uniform and burr free, easy to install. 4、304 Stainless Steel: Our sets are made of nice 304 stainless steel, with fine workmanship, high strength and great corrosion resistance in harsh environments such as high temperature, cold and high humidity. 5、Easy to Carry: As mentioned before, the storage box included in the set keeps all the screws, nuts and washers neatly organized, so it is easy to carry around and great to put into use.