Replaces Standard Railmount Hardware. Allows Toolbox to be installed flush against Backrack. Eliminates gap between Toolbox and Backrack Allows Toolbox to be installed without drilling into truck bed. Standard 21". Optional 31" available.\nUtility Light Bracket; 10.5 in. Octagon Base; For Mounting Round Strobe Lights; Passenger Side; For Backrack Truck Bed Racks;\nNOTE: If using with Safety Rack, Louvered, Open, LV, SM, TR, TL drilling a hole in Frame upright post is required\nUniversal Fitment