Package contents: Pack of 20 M10 hex nuts and bolts with protective caps (17mm spanner) - Note: Before purchasing, please check the required size and package dimensions. Premium plastic: Made of high-quality PE plastic, robust and difficult to deform. The plastic head is corrosion-resistant, does not age, prevents UV rays, has good low-temperature resistance, is lightweight, has good toughness, and protects nuts and bolts. Protective nuts and bolts: These polyethylene hex nuts can protect bolts from rust, water, dust, etc. They reduce dust and rain pollution, prevent bolt corrosion, improve the appearance, and thus extend the bolt's lifespan. Wide application: Suitable for machine equipment, petrochemicals, valves, gas pipelines, bridge barriers, street lights, and other applications. Provides external nuts and bolts to prevent weathering and damage. Designed for hex bolts and nuts, improves the finish of nuts and bolt heads, and is easy to install and remove. is committed to providing every customer with the highest quality customer service.