Magic Half-Square Ruler
Low in-store inventory, may be subject to change.
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This is a unique ruler designed to help you with the half- square triangle. This ruler has all the math built into the ruler so you don't have to think about how much to add. All you have to know is the finished size of the block. You can also use this ruler to square up the blocks. Finished sizes available from 1/2in up to 6in.