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 #7 thru #9 will fit this turnout pad.  The scale thickness is 12" for branchline/siding or 18" Mainline.  Actual thickness is 4.5mm (approx. 3/16") for branchline and 7mm (approx. 9/32" for mainline). Turnout is approx. 20" long, which facilitates extra length to trim to the exact switch utilized.