Outstanding Material Our metal washers are made of high-quality copper, which offers excellent electrical and thermal conductivity, a melting point of 1083°C, and durability for daily use. Easy to Use Copper flat washers feature a smooth surface that reduces friction between fasteners, helps prevent leaks, provides insulation, and resists loosening under pressure. Easy to Store These copper flat washers come in a compartmentalized clear plastic storage box, enabling organized, secure, and convenient storage and transport. Wide Application Suitable for use with water, sump plugs, fuel systems, and plumbing fittings. Also ideal for electrical connections in household appliances, automotive, and marine applications. What’s Included - 30 pcs M5 × 9 × 1 mm - 30 pcs M6 × 10 × 1 mm - 20 pcs M6 × 12 × 1 mm - 20 pcs M8 × 12 × 1 mm - 20 pcs M8 × 14 × 1 mm - 20 pcs M10 × 14 × 1 mm - 20 pcs M12 × 16 × 1 mm - 20 pcs M12 × 18 × 1.5 mm - 20 pcs M14 × 18 × 1 mm Product Name: Metal Washers Material: Copper Quantity: 200 pieces Package Includes: 1 storage box and specified washers Safety Note Small parts—keep away from children to avoid accidental ingestion. Note Color may vary slightly due to lighting and screen settings.