This Turnout is designed to mate up exactly width-wise with the roadbed.  The 45-degree shoulders represent slopes found traditionally on model railroad roadbed.  Any turnout in size from #8 thru #11 will fit this turnout pad.  The scale thickness is 12".  Actual thickness is 3.5mm (approx. 3/16").  Turnout is approx. 15-5/8" long, which facilitates extra length to trim to the exact switch utilized.