FunctionCan be used as a sleeve, spacer or washer, but also as insulation in electronic devices or to prevent electrolysis between different metals. Also used to reduce noise and vibration. Specification: You can receive 200 pieces spacers and a storage box. This set contains 10 pieces of each style: 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm, 12mm, 15mm, 18mm, 20mm spacers. Premium ABS material: the column spacer is made of high-quality ABS material, which is rust-proof, age-resistant, durable and well insulated compared to metal material Widely used: Protects the screw from twisting, corrosion and short circuit. Suitable for commercial or household appliances, automotive, marine and other power equipment with threaded / bolt connector. ThicknessThe round spacer made of nylon has very good insulation and is environmentally friendly, durable, corrosion resistant and flame retardant. It is lightweight and small, easy to carry and use