The MobileTrak3®, one of Datums high density storage systems, offers a number of features that make this little brother of MobileTrak5® better suited for key situations. MobileTrak3® features an enclosed drive mechanism that is hidden behind Datums new space-efficient thin profile end panels. The mechanism helps create a cleaner look to the front of the system. Additionally, the end panel has an externally adjustable chain tensioner that eliminates the need to remove the end panels to make adjustments. Once the end panels are on, there is no need to remove them!