These 4mm scale (OO, EM or P4 gauge) 3D resin printed iron railing posts are printed with a 0.7mm hole through each ball to take a fine wire as a railing. Supplied in a strip of 5 ready for painting, the distance between the balls is 8mm (2 scale feet) and there is adequate material on the bottom of each post to insert into a hole in your baseboard. Add that additional realism to your model with the accurate scale model.