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SET OF 10 PIECES (MARINE QUALITY): This pack includes 10 M8 x 18mm flat washers compliant with the NFE 25514 M (medium washer) standard. A professional solution for strong and high durability assemblies. EXTREME RESISTANCE (AISI 316): Designed in A4 stainless steel (V4A), these washers offer maximum protection against corrosion. It is the indispensable alloy for the most severe environments: seaside, boating and acidic environments. EXACT DIMENSIONS: Inner diameter 8 mm, outer diameter 18 mm, thickness 1.5 mm. Perfectly fit for M8 threaded screws and rods. Expertise ProRaje: We cover all your needs with a complete range from M1.6 to M52. SPECIAL FOR POOL & SALT: Unlike standard A2 stainless steel, A4 stainless steel resists chlorine and salt over a long period. This is the recommended choice for your pool facilities, boat docks, and equipment exposed to spray. PROFESSIONAL QUALITY: Choose ProRaje durability. Our products are certified in accordance with industry standards for your projects in Industry, Boating and Marine. Also available in A2 version for your standard outdoor uses.