The Rugged Series rackmount chassis are designed to withstand the toughest and compact environment and perform industrial applications that require spill proof with 26? in depth. The RG-4630 is designed with a spill proof bezel with a key lock, 1.6mm heavy-duty SECC steel, and shock absorbing drive cage to have the maximum protection. This 4U rugged high performance rackmount chassis is designed with 2 front access USB2.0 ports, 6x 5.25? bay, 2x 3.5? internal bay, 1x 3.5? external bays, and 5.25? slim bay. The IPC Rugged series is the most versatile and tough rackmount chassis for critical application