metallic aluminium triangle ruler size scale drawing 30cm a scale office stationery student ruler drawing mitsubishi ruler 金属铝三棱尺大小比例绘图30cm 刻度尺办公文具学生尺制图三菱尺

71130 plastic small scale [30cm]] 71130b plastic large scale [30cm]] 61130 plastic small scale [30cm]] 61130b plastic large scale [30cm]] 6101-15 aluminum alloy small scale [15cm black]] 6101-15b aluminum alloy large scale [15cm black]] 6101-15 aluminum alloy small scale [15cm blue]] 6101-15b aluminum alloy large scale [15cm blue]] 6101-15 aluminum alloy small scale [15cm rose red]] 6101-15b aluminum alloy large scale [15cm rose red]] 6101-30 aluminum alloy small scale [30cm black]] 6101-30b aluminum alloy large scale [30cm black]] 6101-30 aluminum alloy small scale [30cm blue]] 6101-30b aluminum alloy large scale [30cm blue]] 6101-30 aluminum alloy small scale [30cm rose red]] 6101-30b aluminum alloy large scale [30cm rose red]] german aluminum alloy small scale [30cm black]] german aluminum alloy large scale [30cm black]] german aluminum alloy small scale [30cm silver]] german aluminum alloy large scale [30cm silver]] german aluminum alloy small scale [30cm gold]] german aluminum alloy large scale [30cm gold]]

as shown in the figure