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An even cheaper solution I find to aid rid of electro static problems when on a build are believe it or not car jumper cables with the alligator end connectors, attach one end to the case but as most new cases are painted inside and out just thread an ideal sized bolt through any hole making sure to attain bare metal contact by removing paint from the inner of the hole using a pen knife or something similar and then attach alligator grip to the bolt and the other end just attach to a grounded radiator etc, and as jumper cables come in pairs for added protection wrap some wire around your wrist leaving room to attach one alligator grip and join other end to the same bolt, they are long enough so giving room to work and easily attachable and removable via the clips, still adhere to careful handling of computer items as has others have stated and the removal of any greasy fingerprints too, also a tip for cleaning parts if you haven't got Tim and the like, you can use sterile wipes you get in first aid kits, they're 70% isopropyl alcohol and 2%chlorexidine gluconate which makes them ideal for removing thermal paste and grease and keeping delicate equipment clean and sterile, also surgical spirit bought from any pharmacy is the same thing, people may comment saying am being overly cautious but they fail to mention the latent effects of esd which can cause problems later on down the line by reducing the life expectancy of a component,