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SET OF 10 PIECES (MARINE QUALITY): This pack includes 10 flat washers M12 x 48mm compliant with DIN 9021 standard (large 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 12 mm, outer diameter 48 mm, thickness 3 mm. Perfectly fit for M12 threaded screws and rods. ProRaje Expertise: 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 provides long-lasting resistance to chlorine and salt. It's the recommended choice for your pool facilities, boat docks, and equipment exposed to sea 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 A2 version for your standard outdoor use.