End Cap for Flange Series L-Track End Cap for Flange Profile L-Track. Finish off your flush-mount flange series installation for a professional look. Features a tapered edge to minimize snags and catches on the track edge. Includes Qty 1 End Cap for Flange Profile L-Track | QC06058 These L-Track End Caps finish off your flush-mount flange series installation for a professional look. They feature a tapered edge to minimize snags and catches on the track edge.