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AStarrett 649 Series spindle squares offer convenience & accuracy while tramming the head of vertical milling machines. These spindle squares are easier to use and more precise as compared to conventional methods of tramming using dial test indicators. They ensure perpendicularity and squareness between the work surface & spindle, and come fully assembled with two AGD Group 2 dial indicators. These devices feature solid steel construction with black oxide finish for corrosion resistance and long service life. Variants are available in graduations of 0.0005 and 0.001 inches.