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Set of 20: this set contains 20 pieces M5 x 20 mm flat washers made of high-quality stainless steel, complies with the standard NFE 25514 LL. 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 5mm, outer diameter 20mm, thickness 1mm. Ideal for screws or threaded rods with a diameter of M5. 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.