🔧 Elevate Your Fastening Game with Copper Precision! 12 sizes to meet all your fastening needs. Copper construction ensures durability and corrosion resistance. Perfect for automotive, marine, and industrial uses. Prevents pull-through with a greater bearing surface. Comes in a sturdy case for easy access and organization. 12 Sizes High Heat Resistance 300Pcs The HELIFOUNER Copper Washer Assortment Set includes 300 pieces across 12 sizes, crafted from high-quality copper for superior sealing and durability. Ideal for various applications, this kit ensures you have the right washer for any job, all neatly organized in a convenient storage case.