Review on 280 Piece Grade 12.9 Alloy Steel M3 Hex Socket Cover Head Bolt Screw Nut Assortment Kit with Storage Box - Includes Lengths 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 16mm, 20mm, and 25mm by Edward Henderson

The whole box was filled with oil. It was so much oil that the sticker with all the sizes of the bolts was long since erased. I have tried to remove the oil from the bolts but it is very difficult to remove from fine threads and hex heads. This is also intentional: instead of packing the screw box in a loose plastic bag with an air hole, it is in an airtight bag. That's how it should be, otherwise the oil would leak everywhere. They knew what they were doing. We strongly recommend avoiding this if you don't mind the cleaning work you need to do.