The drive locking mechanisms were a bit tricky, in order for them to lock completely the drives need to be exactly flush with the outside of the front of the case. Then the locking pieces will be able to lock it down. The hard drives had drive rails to mount to the slots, I really like this screw-less touch simply because it is less work to do, and easier on the drives and case so there isn't screw marks all over the HDD cage. . .



Link: BCC Hardware