FastTrack, 48", Rail, Part Of The Rubbermaid FastTrack, Garage Organizational System, Quick & Easy Installation In Minutes, Works With 16" Or 24" Stud Spacing, Made Of Steel For Extra Durability, Allows Complete Adjustability Of Accessories, Accessories Sold Separately, Attach Quickly & Easily To The FastTrack, Rail Allowing You To Make A Customized Garage Storage System That Can Change As Your Storage Needs Change.