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Qualfast M27X2.00 Hex Thin Nut (4)- you get 5
Hexagon Thin Nut, MF (Metric Fine), Steel - Standard (Self Colour), Plain - Grade 4, DIN 439 B (1987).
https://www.bizrate.co.uk/homehardware/qualfast-m27x2-00-hex-thin-nut-oid27500788110.html