4 inch Ratio Ruler
Architectural aluminum ruler
Proportion aluminum ruler
High quality triangular rulers with 6 ratio scales: 1:100, 1:200, 1:300, 1:400, 1:500 & 1:600.
Made of anodized aluminum.
Three lengths - 4 inch, 6 inch and 12 inch.
GA-3310: 12 x 1.4 x 1.4 cm
GA-3315: 12 x 1.4 x 1.4 cm
GA-3330: 32 x 2.6 x 2.6 cm