12 Inch Steel Scale Rule Mascot Precision ToolsStainless steel, 12in long, 1in wide.Contains 4 scales used by model railroaders.Graduations are etched into the metal for permanence and easy reading.Front of the rule has HO, S and O gauge scales, and the N gauge scale is on the back.A handy table for converting drill sizes to decimal equivalents is also included.12 Inch Steel Scale Rule Mascot Precision ToolsStainless steel, 12in long, 1in wide.Contains 4 scales used by model railroaders.Front of the rule has HO, S and O gauge scales, and the N gauge scale is on the back.A handy table for converting drill sizes to decimal equivalents is also included.