Aike&reg; 300PCS M3 Nylon Black Hex Screw Nut Spacer Standoff Varied Length Assortment Box 1. Type specification complete, the quality is reliable. 2. Never rust, beautiful,practical, durable and convenient for using. 3. Packed in a plastic box, good for storage and difficult to damage. 4. Nylon has the characteristics of insulativity,Non-Magnetic,thermal insulation,corrosion resistance and etc. 5. As electronics components, fit for the industries of communication, electroplating, medical device, office equipment, electronics.