Feature Highlights: 1. Versatile & Essential Hardware: This thin, disk-shaped plate with a central hole is a workshop staple. Primarily, it distributes the load from screws or nuts to protect surfaces. It also works perfectly as a spacer, wear pad, vibration damper, locking aid, or pre-load indicator. 2. Secure & Protective Design: For strong, reliable bolted joints, hardened washers are key to maintaining clamp force. These copper washers also prevent galvanic corrosion, effectively insulating steel fasteners from contact with materials like aluminum. 3. Premium Copper Construction: Made from high-quality copper, these washers offer excellent electrical and thermal conductivity. They are durable, resist deformation under load, and provide long-lasting performance. 4. Comprehensive 280-Piece Set: This professional assortment covers a wide range of common sizes. With multiple inner and outer diameters, you'll have the right washer for various DIY repairs, automotive work, or mechanical projects. 5. Convenient & Organized Storage: The set comes in a sturdy plastic compartment box, keeping all washers neatly sorted and easily accessible. No more searching through scattered hardware—everything you need is in one place. Product Details: This 280-piece assorted copper washer set is designed for both professionals and serious DIYers. The high-quality copper ensures good conductivity and durability, while the flat design helps spread pressure and prevent surface damage. Use them to create safer, more secure, and corrosion-resistant connections in automotive, plumbing, machinery, and general assembly tasks. The practical storage box keeps your workspace tidy and your washers ready for any job. Specifications: - Material: Copper - Color: Copper - Type: Flat Washer - Washer Dimensions (IDODThickness) & Quantities: M591mm – 30pcs M6101mm – 30pcs M6121mm – 20pcs M8121mm – 30pcs M10141mm – 30pcs M8141mm – 20pcs M12161mm – 25pcs M14181mm – 25pcs M12181.5mm – 20pcs M16201.5mm – 20pcs M16221.5mm – 15pcs M20261.5mm – 15pcs - Total Quantity: 280 Copper Washers - Package Includes: 280 x Copper Washers, 1 x Plastic Storage Box. Note: Slight color variations may occur due to lighting and monitor differences. Please allow a slight dimensional tolerance of +/- 1-3mm.