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This multifunctional ruler was designed to be small and exquisite,while its function is powerful and multiple.you can use it to draw strait lines with unlimited length,also circle whose radius is between 0cm and 20cm,and arcs with fixed degrees as well.It was quit convinent in both engeneer drawing and daily study.This multifunctionl ruler consists of a straightedge and a disc in the middle of it.There are marks of o-360 degree on the disc,and two round holes in the straightedge.