Features:These hex nuts are made of PA66 eco-friendly nylon which has good acid-base resistance and insulation.Hexagonal shape has 6 sides that gives a good granularity of angles for a tool to approach from.These are many common sizes that you can use for general purpose or projects.These hex nuts will be great replacement for industrial and construction fasteners.Used widely in the home and office appliance, communication equipment, ship assembly and other machinery industry.Specification:Color: Black, White (Optional)Material: PA66 eco-friendly nylonOperating Temperature: -20~+120Flammability Standard: 94-V2Size & Quantity: M2*0.2 20pcsM2.5*0.2 20pcsM3*0.2 20pcsM4*0.3 20pcsM5*0.5 20pcsM6*0.5 20pcsM8*0.8 10pcsM10*0.8 10pcsWeight: 66g / 2.3oz (approx.)Package list:1 box * Nuts