That's why multi-angle ruler is very important for installing floor tile and a round hole in tile 

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SOWELL Six Side Ruler is made by aluminum alloy and ABS plastic that assist worker precisely locate hole on tile. Instead of traditional six side ruler that have to align the scale with the edge of the tile, SOWELL Six Side Locating Hole Ruler have unique “chicken foot” fixed head to align the edge of tile that is more easier and save time.
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