Modbox™ Components Easily Interconnect For A Customized Mobile Workstation, Attach Case Adapter To Side Rails For Convenient Access To Case Contents; Open The Case Lid While Connected To The Side Rails, Secure Fit For Small, Small Extended, And Medium Modbox™ Compatible Cases, Choose From A Variety Of Cases That Contain Useful Tools Such As Klein Pass Through Socket Wrenches, Step Bits, Proflex Impact Drivers, And Precision Drivers; Sold Separately, Easily Attach And Move The Case Adapter Onto Any System Side Rail With One-Handed Release For Added Convenience, Case To Adapter Connection Is The Same As Case To Case Connection For Ease Of Use, Secure The Case Adapter Inside The Rolling Toolbox And Medium Toolbox (Cat. Nos. 54802Mb, 54803Mb) With The Internal Rail Accessory (Cat. No. 54818Mb), Sold Separately