N Scale Package includes one front and one rear coupler. This conversion fits:Kato: GP-50 Locomotives. This kit contains two pilots, two unassembled couplers with universal shim, and 00-90 x 5/16” screws. This conversion requires the use of a #62 (.038” or .97mm) tap drill, a #56 (.046” or 1.2mm diameter) clearance drill, and a 00-90 tap. These tools are available in Micro-Trains® Tap and Drill Set.