Alvin 110P 110 Series 12 inch High Impact Plastic Architect Triangular Scale plastic Made in USA or Imported 12" triangular scale - ideal for scholastic and vocational use. Architect,engineer and mechanical draftsmen graduations. Sharp easy-to-read graduations resist wear. English and metric. All architect scales have the following graduations unless otherwise.noted: 3/32, 3/16,1/8,1/4,1/2,1,3/8,3/4,1; 3 to the foot; one edge to 16ths.