Keep your hydraulic systems, automotive engines, and pipe fittings leak-free with this comprehensive 150-piece copper flat washer assortment kit. Featuring 8 different metric sizes — M6, M8, M10, M12, M14, M16, M18, and M20 — this kit ensures you always have the right sealing washer on hand for virtually any job. The solid copper construction provides excellent malleability and corrosion resistance, allowing each washer to compress and form a reliable, tight seal under pressure. The kit includes sizes ranging from M6x12x1mm up to M20x26x1.5mm, with quantities of 15 to 30 pieces per size, giving you a well-stocked supply for both routine maintenance and unexpected repairs. All washers are neatly organized in a reusable plastic storage case with individual compartments, making it easy to find the size you need quickly. Ideal for mechanics, plumbers, and DIY enthusiasts alike, this assortment is a must-have addition to any toolbox or workshop. Note: Not suitable for children under 6 years of age due to small parts.