Standoff Screw Nut Black, Lsgoodcare 300PCS M3 Nylon Male Female Hex Spacers Screw Nut Stand-off Plastic Accessories Assortment Kit 6MM 8MM 10MM 12MM Material: durable hard nylon and plastic. Nylon Hex Spacers/ Screws/ Nuts Assorted Kit Operating temperature: -20 degrees -120 degrees Celsius, fire protection requirements: 94-V2 Easy to install and durable to use. M3 Black color total 300 pieces. Come with the plastic box.