No instructions for use, measurements are in millimeters not inches which is not bad, just different. Sharp edges that you can cut if you're not careful. Line holes are larger than a pencil unless you are using a carpenter's pencil, in which case it may be too big. I bought it to put lines in a corner for precision, which it does well. Will speed square do the same? Thing? Yes. Would I buy it again? Probably no
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