ALVIN600 Series 6-Inch High Impact Plastic Engineer Triangular Scale (610E)

ALVIN 610E Metric Engineer Triangle Scale, Multipurpose Ruler for Drawing, Planning, and Design, Drafting and Architecture Tool - 6 Inches

Alumicolor Aluminum Engineer Color-Coded Solid Drafting Scale, 6IN, Silver

Pacific Arc Engineering Scale Ruler, 6" Scale Ruler for Architectural Designs, Engineering, or Drafting