Alvin 744PM metric drafting scale ruler. Professional quality, 30 cm mechanical draftsman metric scale is made from high-impact plastic with white, non-reflecting dull-matte faces, and tapered edges. Draftsman ruler has hot-stamped graduations and color-coded furrows. Supplied in storage case. Graduations: (1:2.5, 1:5, 1:10, 1:20, 1:50, 1:100). Alvin 744PM metric draftsman rulers are made in Germany.