... rolled plated; 3.Supplied bolt fixings for devices; 4.Black/Silver; 5.Lockable rear door 1:Exquisite design with precise craftsmanship;2 ... 55%;4:optional two cool fans and four cool fans;5:Lockable adjustable cable entry for dust-proof on the top ... 2mmSurface finishDegrease, pickling, pfosphoric, rust prevention and parkerizing, pure water cleaning, static powder coatedHeight:4U,6U,12u,18U,22U, 27U, 32U ...