RoHS stands for Restriction of Hazardous Substances. RoHS, also known as Directive 2002/95/EC, originated in the European Union and restricts the use of specific hazardous materials found in electrical and electronic products (known as EEE). All applicable products in the EU market after July 1, 2006 must pass RoHS compliance. The substances banned under RoHS are lead (Pb), mercury (Hg), cadmium (Cd), hexavalent chromium (CrVI), polybrominated biphenyls (PBB), polybrominated diphenyl ethers (PBDE), and four different phthalates (DEHP, BBP, BBP, DIBP). RoHS StarTech.com HSB100SATBK, 5.25", Bezel panel, Black, 3.5", Serial ATA, Serial ATA II, Serial ATA III, Aluminum, PU plastic StarTech.com HSB100SATBK. Size (imperial): 5.25", Type: Bezel panel, Product color: Black. Width: 5.87" (149 mm), Depth: 7.24" (184 mm), Height: 1.65" (42 mm). Package width: 8.11" (206 mm), Package depth: 6.26" (159 mm), Package height: 2.01" (51 mm). Number of lock keys included: 2 pc(s) http://www.micromart.co.uk/component/313/startech-525-trayless-hot-swap-mobile-rack-review I use mobile racks in many of my systems, because I like the idea of being able to remove the drives without opening the PC enclosure. These days, as long as you have an external bay spare they're a useful option, especially if you want to move large amou...