1. Covers 9 common metric sizes (including M5x9x1mm, M6x10x1mm, M6x12x1mm, M8x12x1mm, M8x14x1mm, M10x14x1mm, M12x16x1mm, M12x18x1.5mm, M14x18x1mm), precisely matching various automotive and plumbing sealing requirements. 2. Forged from high-quality pure copper, featuring excellent electrical and thermal conductivity. Offers superior high-temperature and pressure resistance compared to standard rubber or steel washers, remaining resistant to aging over long-term use. 3. Smooth and burr-free surface evenly distributes tightening pressure. Deforms slightly when tightened to tightly conform to joints, creating an outstanding seal against oil, water, and air leaks. 4. Housed in a sturdy polypropylene (PP) transparent compartment box with a clear size specification chart on the lid. Washers are stored separately to prevent mixing and ensure quick access, significantly improving work efficiency. 5. Widely used for engine oil drain plugs, oil pan bolts, fuel lines, brake line fittings, hydraulic fittings, and daily plumbing and mechanical repairs, making it a practical spare parts set for mechanics and DIY enthusiasts.
