Cast aluminium scale rule with triangular body for safer cutting and scoring of materials. Clearly marked metric graduations. 6 scales for precision drawing. Concave base reduces smearing when drawing. Scales 1:20, 1:25, 1:50, 1:75, 1:100, 1:125. Cast aluminium scale rule with triangular body for safer cutting and scoring of materials. Clearly marked metric graduations. 6 scales for precision drawing. Concave base reduces smearing when drawing. Scales 1:20, 1:25, 1:50, 1:75, 1:100, 1:125.