Good material but watch M5 cages: beautiful scam that inflate the final price

I weigh my words: I was offered a first model of this product because I really needed in my office.
The material is nice, except that it stops there: if it is not expensive to purchase, it becomes because of the very special screws: M5 where everybody works for this type usually M6 product.
The rack is provided with enough install 5 rackable devices, while the kit may contain up to 12 ...
Startech The trick is simple: no one sells cheap rack but you do need to buy hardware in addition, almost every time!
FYI, as I lacked what Racker 5 devices 1 U, and after comparing the price difference, I opted to purchase a second rack for a pack of 20 + 20 screws M5 cage nuts also cost expensive than RK12OD!
Then as I Bonus I resell the rack without screws or that I will keep for spare parts.
My advice: make sure that the screws and bolts in M6 instead of M5, M6 because the hardware is 5x less expensive to buy ...