The Front Runner Tracks have been designed to accommodate a stud plate which slides into the t-slotted track and enables the foot assembly to be secured with nyloc nuts before the roof rack bolts on to the foot. Made from t-slotted aluminum extrusion.Often used for trailers and canopies to mount a rack or load bars.Each track is supplied with fitted double sided tape and a section of pre-cut rubber, which is used to protect the vehicle roof from the track.Powder coated black.Comes in pairs.