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
Bolt Base 4mm A2 Stainless Steel Grub Screws Hex Socket Set Cup Point M4 X 12-5 : Amazon.co.uk: DIY & Tools