For the price, this sleeve is the best what you can get. Easy to handle and use. Now I can let my hard disks on my desk unconcerned. If I then want to use the hard drives in my dock, just the small cap deduct finished. I was (still am) so excited about this Hüller I have the same again bought two of the other hard disks. For someone who wants his internal hard drives use external, absolute buy recommendation.