10 Inch 254mm Calibration Cube with 05 Inch 127mm Hole
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1.0 Inch (25.4mm) Calibration Cube with 0.5 Inch (12.7mm) Hole.

Calibration cube with a hole in it models ...

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1.0 Inch (25.4mm) Calibration Cube with 0.5 Inch (12.7mm) Hole. alternatives
Calibration Cube
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