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No time for rackspace math? Use the Rack Ruler instead. It�s a genuinely handy tape measure incremented in both rackspaces (red) and inches (black) down to 1/32� scale. Measuring 1/2� wide by 96� (8 feet) long, its Mylar-coated retracting steel tape is housed in a tough ABS case with a thumb lock and belt clip. This is a rugged tool, not a toy � precision made by Starrett�.