For assembly. Went very quickly by hand, easier and above all more pleasant than the stupid Pins from stock fan that can ram through the mainboard must that trooper. For my LGA1155 it was easy: old fan cooling, ethanol (from work in the lab, each pure alcohol goes) the old thermal grease is removed, installed neuenn fan following the instructions. Done. Fiddly only because I have apparently huge RAM modules. Who is concerned about the installation, should be used with tablet / mobile phone / laptop or simply foresee a tutorial on YouTube, it's really easy.
Conclusion: Buy recommendation for those who want to replace the standard retail fan of their CPU's.