Craft Supplies › Helix › Metric Scale

this triangular scale rule is a stylish rule suitable for architects. the heli... this triangular scale rule is a stylish rule suitable for architects. the helix 30cm triangular scale rule has colour coded sides with markings of red 1:100 1:200 1:5 1:50 blue 1:2 1:20 1:10 1:1 green 1:1250 1:2500 1:5000 1:1000. scale rulers are used... more