Product Description Manufactured; Made of 304 stainless steel and nylon, the nylon insert hooks with a thread to prevent loosening, one of the highest forms of heavy duty metal. corrosion, which lasts longer than other nuts on the market; today. The sturdy polymer insert nuts are very durable. rotation, so that the counter nuts will not weaken and loosen under vibration and torque, reducing the resistance of the glow. Guaranteed to stay intact and in a firm grip, making it virtually indestructible. M3 M4 M5 M6 M6 M10 M12 to meet different needs. The nylon nuts are arranged in a storage box, with which you can easily find them in the series and avoid the loss if necessary. The nuts are stored in a storage box so that you can easily find them in the series and avoid loss if necessary. Attention: The products contain small parts. those. Do not let children play to avoid accidental ingestion. Specifications: Material: 304 stainless steel Package size: 17.6 * 10.2 * 2.3cm Weight: 460g