Slim Form Factor (SFF) Case
SFF-5XX Series
*Tool-less*
*Small Chassis With High Standard Expansion Strength
*Expansion by 7.5L 
SFF-510, 8.3L volume, but it accommodates a slim ODD,3.5 and 2.5 HDD, 2.5 HDD, 4x low-profile PCI cards, it offers exceptional flexibility and scalability for enhanced multi-function applications!