Indi-All Test Indicator Holder 52-566-853-0 Fowler's Indi-all indicator holder finds the center position without removing the tool from the machine. It mounts with a single set screw directly on the machine quill, bypassing the working tool. Use for milling machines, jigborers and Bridgeport mills (J-head). ¢ Clamping dia. 1-7/8"; 3 point adjustment¢ Accepts all indicators with 532" shank or dovetail. Reach from 0-12" diameter¢ Provides readings accurately and quickly without disturbing the workpiece¢ Arm length from clamp 4-12"