High Quality Stainless Steel provides strength and offers good corrosion resistance in many environments; Different Size: M2 / 3 / 4 / 5 Having enough stress-bearing surface that can be screwed tighter. perfect for use in confined areas where the head needs to be flush or the surface. Used widely in the home and office appliance, communication equipment, ship assembly and other machinery industry. This set is organized by size/type in a transparent storage case for quick access and protection. Colour:silver Material:Stainless steel Package Contents: 1 x Hexagon socket screw set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.