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Manufactured to DIN 9021 (dimensions now carried under EN ISO 7093-1) for a large load-spreading area. Outer diameter 50mm (1.97in), thickness 3.0mm (0.12in) - sized to fit an M16 bolt or screw with plenty of bearing surface around the shank. Steel with a bright zinc plated (BZP) finish for durable, general-purpose corrosion resistance indoors and in moderate outdoor conditions. Also known as a fender washer, mudguard washer or repair washer - stops a fastener head digging into, cracking or pulling through soft or worn material. Every metric dimension has its imperial equivalent, so the right size can be cross-checked against either measurement system.