X255D 2u 550mm ATX with 6 HDD Spaces - Takes 2u Single Psu

I love this case, its well designed and built. The internal fans are a nice touch. I have 3 of them now and plan to add more of the same design. Unfortunately it is let down by the rackmount rail kit. In a standard rackmount environment, the mounting posts do not fit well into a traditional rackmount post. Also, oddly, the screws mount holes are not standard cage nut M5 or M6 size. Fitting the rackmount rails has to be bodged unfortunately. The screws are not deep enough, so I had to buy alternatives with a greater length, and also had to purchase some nuts to go on the other side and it has been quite awkward to fit them. You will also see from the photo, that any screw, supplied or third party, will immediately rub against the mounting post, it is not central. This also makes racking or de-reracking a longer and more complex process than it needs to be. Great case, shame amount the mounting rails.