Description: 【PREMIUM COPPER CONSTRUCTION】: Crafted from quality copper, these flat washers offer excellent electrical conductivity, and exceptional thermal conductivity, ensures long term durability even in harsh industrial or automotive environments 【SUPERIOR LEAKPROOF SEAL】: Engineered for maximum sealing efficiency, these copper gaskets create a tight, secure, and leakproof connection between surfaces, resistant to high temperatures and pressure 【VERSATILE APPLICATIONS】: These flat sealing washers are ideal for sump plugs, water lines, hydraulic fittings, and lines in automotive, marine, and generator engines, also widely used in industrial machinery, pumps, valves, and other fastening systems 【PRODUCT DIMENSIONS】: The 300pcs assortment oil seals gaskets includes 35pcs M5x9x1, 35pcs M6x10x1, 25pcs M6x12x1, 35pcs M8x12x1, 30pcs M10x14x1, 20pcs M8x14x1, 25pcs M12x16x1, 25pcs M14x18x1, 20pcs M12x18x1.5, 20pcs M16x20x1.5, 15pcs M16x22x.5 and 15pcs M20x26x1.5 【COMPREHENSIVE 300PCS ASSORTMENT】: This flat washers assortment kit includes 300 copper washers across 12 of the most commonly used metric sizes, ensuring you have the right gasket for the job Specification: Material: Copper Size Chart: M5x9x1 35pcs M6x10x1 35pcs M6x12x1 25pcs M8x12x1 35pcs M10x14x1 30pcs M8x14x1 20pcs M12x16x1 25pcs M14x18x1 25pcs M12x18x1.5 20pcs M16x20x1.5 20pcs M16x22x.5 15pcs M20x26x1.5 15pcs Package Includes: 300 Copper Washers Gaskets Note: Please allow slight dimension difference due to different manual measurement.