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Pack of 10 - This set contains 10 pieces of M20 x 40mm flat washers made of high quality stainless steel, complies with NFE 25514 M standard. EXCELLENT RESISTANCE: Made from A4 stainless steel (V4A / AISI 316), these washers are robust, corrosion resistant and suitable for use in humid environments or outdoors. Precise dimension: inner diameter 20mm, outer diameter 40mm, thickness 3mm. Ideal for screws or threaded rods with a diameter of M20. Other sizes available: M1.6 to M52. RUST PROOF Unlike galvanized or galvanized metal washers, these rust proof washers will not rust, ensuring optimal durability even in difficult conditions. GUARANTEED QUALITY ProRaje products meet industry standards and offer a wide range of A2 A4 stainless steel screws, bolts, nuts and washers.