This comprehensive copper washer assortment kit from Taoxekoro contains 100 pieces of flat ring seals in sizes ranging from M4 to M14, perfect for various mechanical and plumbing applications. The kit includes seven different sizes: M4 (7x1mm), M5 (9x1mm), M6 (10x1mm), M8 (12x1mm), M10 (14x1mm), M12 (16x1mm), and M14 (18x1mm) washers. Each size is neatly organized in a durable plastic storage box with individual compartments for easy access and identification. These copper washers are ideal for sealing joints, preventing leaks, and providing thermal protection in automotive, plumbing, and industrial applications. The sturdy storage case features a secure snap-lock closure to keep the washers organized and protected. Whether you're a professional mechanic, plumber, or DIY enthusiast, this assortment provides the essential sizes needed for common repair and maintenance tasks.