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N Scale Package includes one front and one rear coupler. This conversion fits: Atlas: RSD-12 Locomotives. This kit comes with a pair of assembled Reverse Draft Couplers (RDA). You will need a #62 (.038” or .96mm) tap drill, a #56 (.046” or 1.2mm) clearance drill and a #00-90 tap to complete the installation. If you don’t already have them you may purchase our Tap and Drill Set.