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The 12-1/2" square is a two color ruler (yellow and black) that works great on any color surface. The top side has thin black markings for use on light colored surfaces. Flip it over and that side has thin yellow markings for use on dark colored surfaces. Use it for making large squares up to 12-1/2", squaring up ends and blocks, making triangles and diamond shapes. It is available with or without our patented no-slip surface!
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