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SET OF 5 PIECES (MARINE QUALITY): This pack includes 5 flat washers M20 x 40 mm compliant with NFE 25514 M standard (medium washer). 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. Precise dimensions: inner diameter 20 mm, outer diameter 40 mm, thickness 3 mm. Perfectly fit for M20 threaded screws and rods. Expertise ProRaje: We cover all your needs with a complete range ranging from M1.6 to M52. SPECIAL FOR POOL & SALT: Unlike standard A2 stainless steel, A4 stainless steel resists chlorine and salt long-term. It is the recommended choice for your pool facilities, boat docks, and equipment exposed to spray. PROFESSIONAL QUALITY: Opt for ProRaje durability. Our products are certified in accordance with industry standards for your projects in Industry, Boating and Marine. Also available in an A2 version for your standard outdoor uses.