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measuring - Does the outer diameter of 4.78 indicate an M4 or an M5 bolt? - Home Improvement Stack Exchange
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M4, Socket Screw Button Head, A2/ 304 Stainless Steel, ISO 7380 – Fixaball Ltd. Fixings and Fasteners UK
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Bolt Base 4mm A2 Stainless Steel Grub Screws Hex Socket Set Cup Point M4 X 12-5 : Amazon.co.uk: DIY & Tools
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Pack of 6, M4 x 18mm (4mm) A2 Stainless Socket Cap Screws with Free A2 Stainless Steel NYLOC Nuts (Pack of 6), Steel HEX Head : Amazon.co.uk: DIY & Tools
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