General description This 12 Sizes Copper Gasket Box includes a solid copper valve set with 280 pieces of assorted flat washers. Made from high-quality copper, these washers offer excellent electrical and thermal conductivity, making them ideal for various applications. Technical specifications Material: Copper Quantity: 280 pieces Sizes: 12 different sizes Usage Distributes load and prevents damage to surfaces Insulates steel screws from surfaces Can be used as a spacer, wear pad, preload indicator device, and locking device Reduces vibration Applicable when the hole diameter is larger than the fastening nut Other information Durable design for long-term use