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; Center Mount; For Mounting Round Strobe Lights; Drivers Side; For Backrack Truck Bed Racks;\nNOTE: If using with Safety Rack, Louvered, Open, LV, SM, TR, TL longer bolts are required (not included) \nUniversal Fitment