0 to 12 Inch Diameter Test Indicator Holder - For Use with 3/8 Inch Shank Measuring Instrument. The only universal indicator holder with the ability to adjust easily and accurately. Eliminates indicator sag in both vertical and horizontal applications. Will except all dovetail and 5/32 shanked indicators. 3/8 mounting shank. Movement range from 10deg. past center to 100deg. from center. Constant tension for quick adjustments. MSC Part# 01297076 (sweep-it)