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This coupler box is for use with a modified Micro-Trains long shank True Scale Coupler coupler that has the spring 'fingers' removed and the two coupler shanks welded together. You will also need a 00-90 flat head screw to mount it. There are 8 boxes and lids included, enough for 4 cars.
I also sell a coupler gauge that will help with setting the floor height for the coupler box and provide a way to be more consistant with the coupler height.